Japanese aircraft carrier Akagi

Akagi was laid down as an Amagi-class battlecruiser at Kure, Japan, on 6 December 1920. Construction was halted, however, when Japan signed the Washington Naval Treaty on 6 February 1922. The treaty placed restrictions on the construction of battleships and battlecruisers although it authorized conversion of two battleship or battlecruiser hulls under construction into aircraft carriers of up to 33,000 long tons (34,000 t) displacement. The IJN had decided, following the launch of its first aircraft carrier, Hōshō, to construct two larger, faster carriers for operations with major fleet units. The incomplete hulls of Amagi and Akagi were thus selected for completion as the two large carriers under the 1924 fleet construction program.[1][2] ¥24.7 million was originally budgeted to complete Akagi as a battlecruiser and an estimated ¥8 million had been expended when construction stopped in February 1922. Shortly thereafter, the Diet approved an additional ¥90 million to complete Akagi and Amagi as carriers.[3] Her guns were turned over to the Imperial Japanese Army for use as coastal artillery; one of her main-gun turrets was installed on Iki Island in the Strait of Tsushima in 1932.[4] The rest of her guns were placed in reserve and scrapped in 1943.[5]

Akagi on 6 April 1925, prior to her launch at Kure

Construction of Akagi as an aircraft carrier began on 19 November 1923. Amagi's hull was damaged beyond economically feasible repair in the Great Kantō earthquake of 1 September 1923 and was broken up and scrapped. Akagi, the only remaining member of her class, was launched as a carrier on 22 April 1925 and commissioned at Kure Naval Arsenal on 25 March 1927, although trials continued through November 1927. She was the second carrier to enter service with the IJN, after Hōshō and before Kaga (which replaced Amagi).[1][6]

Since Akagi was initially conceived as a battlecruiser, the prevailing ship naming conventions dictated that she (like her sister ships) be named after a mountain. Akagi came from Mount Akagi, a dormant volcano in the Kantō region (the name literally means "red castle"). After she was redesignated as an aircraft carrier, her mountain name remained, in contrast to ships like Sōryū that were originally built as aircraft carriers, which were named after flying creatures. Her name was previously given to the Maya-class gunboat Akagi.[7]

Akagi was completed at a length of 261.21 meters (857 ft) overall. She had a beam of 31 meters (101 ft 8 in) and, at deep load, a draft of 8.08 meters (26 ft 6 in). She displaced 26,900 long tons (27,300 t) at (standard) load, and 34,364 long tons (34,920 t) at full load, nearly 7,000 long tons (7,100 t) less than her designed displacement as a battlecruiser.[8] Her complement totaled 1,600 crewmembers.[9]

Akagi and Kaga were completed with three superimposed flight decks, the only carriers ever to be designed so. The British carriers converted from "large light cruisers", Glorious, Courageous, and Furious, each had two flight decks, but there is no evidence that the Japanese copied the British model. It is more likely that it was a case of convergent evolution to improve launch and recovery cycle flexibility by allowing simultaneous launch and recovery of aircraft.[10] Akagi's main flight deck was 190.2 meters (624 ft 0 in) long and 30.5 meters (100 ft) wide,[11] her middle flight deck (beginning right in front of the bridge) was only 15 meters (49 ft 3 in) long and her lower flight deck was 55.02 meters (180 ft 6 in) long. The utility of her middle flight deck was questionable as it was so short that only some lightly loaded aircraft could use it, even in an era when the aircraft were much lighter and smaller than during World War II.[12] The upper flight deck sloped slightly from amidships toward the bow and toward the stern to assist landings and takeoffs for the underpowered aircraft of that time.[13]

Akagi on trials off the coast of Iyo, 17 June 1927, with all three flight decks visible

As completed, the ship had two main hangar decks and a third auxiliary hangar, giving a total capacity of 60 aircraft. The third and lowest hangar deck was used only for storing disassembled aircraft. The two main hangars opened onto the middle and lower flight decks to allow aircraft to take off directly from the hangars while landing operations were in progress on the main flight deck above. The upper and middle hangar areas totaled about 80,375 square feet (7,467.1 m²), the lower hangar about 8,515 square feet (791.1 m²). No catapults were fitted. Her forward aircraft lift was offset to starboard and 11.8 by 13 meters (38 ft 9 in × 42 ft 8 in) in size. Her aft lift was on the centerline and 12.8 by 8.4 meters (42 ft 0 in × 27 ft 7 in). The aft elevator serviced the upper flight deck and all three hangar decks. Her arresting gear was an unsatisfactory British longitudinal system used on the carrier Furious that relied on friction between the arrester hook and the cables. The Japanese were well aware of this system's flaws, as it was already in use on their first carrier, Hōshō, but had no alternatives available when Akagi was completed. It was replaced during the ship's refit in 1931 with a Japanese-designed transverse cable system with six wires and that was replaced in turn before Akagi began her modernization in 1935 by the Kure Model 4 type (Kure shiki 4 gata). There was no island superstructure when the carrier was completed; the carrier was commanded from a space below the forward end of the upper flight deck.[12][14] The ship carried approximately 150,000 US gallons (570,000 L) of aviation fuel for her embarked aircraft.[15]

As originally completed, Akagi carried an air group of 28 Mitsubishi B1M3 torpedo bombers, 16 Nakajima A1N fighters and 16 Mitsubishi 2MR reconnaissance aircraft.[8]

Akagi underway in 1929 with aircraft on the upper flight deck and two gun turrets on the middle flight deck

Akagi was armed with ten 50-caliber 20 cm 3rd Year Type No. 1 guns, six in casemates aft and the rest in two twin-gun turrets, one on each side of the middle flight deck. They fired 110-kilogram (240 lb) projectiles at a rate of 3–6 rounds per minute with a muzzle velocity of 870 m/s (2,900 ft/s); at 25°, this provided a maximum range between 22,600 and 24,000 meters (24,700 and 26,200 yd). The turrets were nominally capable of 70° elevation to provide additional anti-aircraft fire, but in practice the maximum elevation was only 55°. The slow rate of fire and the fixed 5° loading angle minimized any real anti-aircraft capability.[16] This heavy gun armament was provided in case she was surprised by enemy cruisers and forced to give battle, but her large and vulnerable flight deck, hangars, and superstructure made her more of a target in any surface action than a fighting warship. Carrier doctrine was still evolving at this time and the impracticality of carriers engaging in gun duels had not yet been realized.[17][Note 1]

The ship carried dedicated anti-aircraft armament of six twin 45-caliber 12 cm 10th Year Type gun mounts fitted on sponsons below the level of the funnels, where they could not fire across the flight deck, three mounts per side.[19] These guns fired 20.3-kilogram (45 lb) projectiles at a muzzle velocity of 825–830 m/s (2,710–2,720 ft/s); at 45°, this provided a maximum range of 16,000 meters (17,000 yd), and they had a maximum ceiling of 10,000 meters (11,000 yd) at 75° elevation. Their effective rate of fire was 6–8 rounds per minute.[20]

Akagi's waterline armored belt was reduced from 254 to 152 mm (10 to 6 in) and placed lower on the ship than originally designed. The upper part of her torpedo bulge was given 102 mm (4 in) of armor. Her deck armor was also reduced from 96 to 79 mm (3.8 to 3.1 in).[21] The modifications improved the ship's stability by helping compensate for the increased topside weight of the double hangar deck.[13]

In Akagi's predecessor, Hōshō, the hot exhaust gases vented by swivelling funnels posed a danger to the ship, and wind-tunnel testing had not suggested any solutions. Akagi and Kaga were given different solutions to evaluate in real-world conditions. Akagi was given two funnels on the starboard side. The larger, forward funnel was angled 30° below horizontal with its mouth facing the sea, and the smaller one exhausted vertically a little past the edge of the flight deck. The forward funnel was fitted with a water-cooling system to reduce the turbulence caused by hot exhaust gases and a cover that could be raised to allow the exhaust gases to escape if the ship developed a severe list and the mouth of the funnel touched the sea. Kaga adopted a version of this configuration when she was modernized during the mid-1930s.[22]

Akagi was completed with four Gihon geared steam turbine sets, each driving one propeller shaft, that produced a total of 131,000 shaft horsepower (98,000 kW). Steam for these turbines was provided by nineteen Type B Kampon boilers with a working pressure of 20 kg/cm² (1,961 kPa; 284 psi). Some boilers were oil-fired, and the others used a mix of fuel oil and coal. As a battlecruiser, she was expected to achieve 28.5 knots (52.8 km/h; 32.8 mph), but the reduction in displacement from 41,200 to 34,000 long tons (41,900 to 34,500 t) increased her maximum speed to 32.5 knots (60.2 km/h; 37.4 mph), which was reached during her sea trials on 17 June 1927. She carried 3,900 long tons (4,000 t) of fuel oil and 2,100 long tons (2,100 t) of coal that gave her a range of 8,000 nautical miles (15,000 km; 9,200 mi) at 14 knots (26 km/h; 16 mph).[23]

Crewmembers gather on the flight deck of Akagi at Hitokappu Bay, Kuriles in November 1941 prior to the attack on Pearl Harbor. The other carriers in the background are, from left to right: Kaga, Shōkaku, Zuikaku, Hiryū, and Sōryū.

In preparation for the attack, the ship was anchored at Ariake Bay, Kyushu beginning in September 1941 while her aircraft were based at Kagoshima to train with the other 1st Air Fleet air units for the Pearl Harbor operation. Once preparations and training were completed, Akagi assembled with the rest of the First Air Fleet at Hitokappu Bay in the Kuril Islands on 22 November 1941. The ships departed on 26 November 1941 for Hawaii.[48]

A6M2 Zero fighters prepare to launch from Akagi as part of the second wave during the attack on Pearl Harbor

Commanded by Captain Kiichi Hasegawa, Akagi was Vice Admiral Chūichi Nagumo's flagship for the striking force for the attack on Pearl Harbor[39] that attempted to cripple the United States Pacific Fleet. Akagi and the other five carriers, from a position 230 nautical miles (430 km; 260 mi) north of Oahu, launched two waves of aircraft on the morning of 7 December 1941. In the first wave, 27 Nakajima B5N "Kate" torpedo bombers from Akagi torpedoed the battleships Oklahoma, West Virginia, and California while 9 of the ship's Mitsubishi A6M Zeros attacked the air base at Hickam Field. In the second wave, 18 Aichi D3A "Val" dive bombers from the carrier targeted the battleships Maryland and Pennsylvania, the light cruiser Raleigh, the destroyer Shaw, and the fleet oiler Neosho while nine "Zeros" attacked various American airfields. One of the carrier's Zeros was shot down by American anti-aircraft guns during the first wave attack, killing its pilot.[49] In addition to the aircraft which participated in the raid, three of the carrier's fighters were assigned to the CAP. One of the carrier's Zero fighters attacked a Boeing B-17 Flying Fortress heavy bomber that had just arrived from the mainland, setting it on fire as it landed at Hickam, killing one of its crew.[50]

In January 1942, together with the rest of the First and Fifth Carrier Divisions, Akagi supported the invasion of Rabaul in the Bismarck Archipelago, as the Japanese moved to secure their southern defensive perimeter against attacks from Australia. She provided 20 B5Ns and 9 Zeros for the initial airstrike on Rabaul on 20 January 1942. The First Carrier Division attacked Allied positions at nearby Kavieng the following day, of which Akagi contributed 9 A6M Zeros and 18 D3As. On the 22nd, Akagi's D3As and Zeros again attacked Rabaul before returning to Truk on 27 January.[51] The Second Carrier Division, with Sōryū and Hiryū, had been detached to support the invasion of Wake Island on 23 December 1941 and did not reunite with the rest of the carrier mobile striking force until February 1942.[52]

Akagi, along with Kaga and the carrier Zuikaku, sortied in search of American naval forces raiding the Marshall Islands on 1 February 1942, before being recalled. On 7 February Akagi and the carriers of the First and Second Carrier Divisions were ordered south to the Timor Sea where, on 19 February, from a point 100 nautical miles (190 km; 120 mi) southeast of the easternmost tip of Timor, they launched air strikes against Darwin, Australia, in an attempt to destroy its port and airfield facilities to prevent any interference with the invasion of Java. Akagi contributed 18 B5Ns, 18 D3As, and 9 Zeros to the attack, which caught the defenders by surprise. Eight ships were sunk, including the American destroyer Peary, and fourteen more were damaged. None of the carrier's aircraft were lost in the attack and the attack was effective in preventing Darwin from contributing to the Allied defense of Java. On 1 March, the American oiler Pecos was sunk by D3As from Sōryū and Akagi. Later that same day the American destroyer Edsall was attacked and sunk by D3As from Akagi and Sōryū, in combination with gunfire from two battleships and two heavy cruisers of the escort force. Akagi and her consorts covered the invasion of Java, although her main contribution appears to have been providing 18 B5Ns and 9 Zeros for the 5 March air strike on Tjilatjap. This group was very successful, sinking eight ships in the harbor there and none of Akagi's aircraft were lost. Most of the Allied forces in the Dutch East Indies surrendered to the Japanese later in March. The Kido Butai then sailed for Staring Bay on Celebes Island to refuel and recuperate.

Akagi leaving Celebes Island for the attack on Colombo, 26 March 1942. In the background are other carriers and battleships of the carrier striking force. Rolled futon mattresses have been lashed to the island to provide extra protection from enemy attack.

On 26 March, Akagi set sail for the Indian Ocean raid with the rest of the Kido Butai. The Japanese intent was to defeat the British Eastern Fleet and destroy British airpower in the region in order to secure the flank of their operations in Burma.[53] On 5 April 1942, Akagi launched 17 B5Ns and 9 Zeros in an air strike against Colombo, Ceylon, which damaged the port facilities. None of the aircraft were lost and the Zero pilots claimed to have shot down a dozen of the defending British fighters. Later that day, 17 D3As from Akagi helped to sink the British heavy cruisers Cornwall and Dorsetshire. On 9 April, she attacked Trincomalee with 18 B5Ns, escorted by 6 Zeros which claimed to have shot down 5 Hawker Hurricane fighters (only two of which can be confirmed from Allied records) without loss to themselves. Meanwhile, a floatplane from the battleship Haruna spotted the small aircraft carrier Hermes, escorted by the Australian destroyer Vampire, and every available D3A was launched to attack the ships. Akagi contributed 17 dive bombers and they helped to sink both ships; they also spotted the oil tanker RFA Athelstone, escorted by the corvette Hollyhock, and sank both without loss. During the day's actions, the carrier narrowly escaped damage when nine British Bristol Blenheim bombers from Ceylon penetrated the CAP and dropped their bombs from 11,000 feet (3,400 m), just missing the carrier and the heavy cruiser Tone.[54] Four of the Blenheims were subsequently shot down by CAP fighters and one was shot down by aircraft from the carriers' returning air strike.[55] After the raid, the carrier mobile striking force returned to Japan to refit and replenish.[56]

On 19 April 1942, while near Taiwan during the transit to Japan, Akagi, Sōryū, and Hiryū were sent in pursuit of the American carriers Hornet and Enterprise, which had launched the Doolittle Raid. They found only empty ocean, however, for the American carriers had immediately departed the area to return to Hawaii. Akagi and the other carriers shortly abandoned the chase and dropped anchor at Hashirajima anchorage on 22 April.[57] On 25 April, Captain Taijiro Aoki relieved Hasegawa as skipper of the carrier.[58] Having been engaged in constant operations for four and a half months, the ship, along with the other three carriers of the First and Second Carrier Divisions, was hurriedly refitted and replenished in preparation for the Combined Fleet's next major operation, scheduled to begin one month hence.[59] The Fifth Carrier Division, with Shōkaku and Zuikaku, had been detached in mid-April to support Operation Mo, resulting in the Battle of the Coral Sea. While at Hashirajima, Akagi's air group was based ashore in Kagoshima and conducted flight and weapons training with the other First Air Fleet carrier units.[60]

First Air Fleet commander Vice Admiral Chūichi Nagumo, for whom Akagi served as flagship from Pearl Harbor to Midway

Concerned by the US carrier strikes in the Marshall Islands, Lae-Salamaua, and the Doolittle raids, Yamamoto determined to force the US Navy into a showdown to eliminate the American carrier threat. He decided to invade and occupy Midway Island, which he was sure would draw out the American carrier forces to battle. The Japanese codenamed the Midway invasion Operation MI.[61]

On 25 May 1942, Akagi set out with the Combined Fleet's carrier striking force in the company of carriers Kaga, Hiryū, and Sōryū, which constituted the First and Second Carrier Divisions, for the attack on Midway Island. Once again, Nagumo flew his flag on Akagi. Because of damage and losses suffered during the Battle of the Coral Sea, the Fifth Carrier Division with carriers Shōkaku and Zuikaku were absent from the operation. Akagi's aircraft complement consisted of 24 Zeros, 18 D3As, and 18 B5Ns.[62][Note 2]

With the fleet positioned 250 nautical miles (460 km; 290 mi) northwest of Midway Island at dawn (04:45 local time) on 4 June 1942, Akagi's portion of the 108-plane combined air raid was a strike on the airfield on Eastern Island with 18 dive bombers escorted by nine Zeros. The carrier's B5Ns were armed with torpedoes and kept ready in case enemy ships were discovered during the Midway operation. The only loss during the raid from Akagi's air group was one Zero shot down by AA fire and three damaged; four dive bombers were damaged, of which one could not be repaired.[64] Unbeknownst to the Japanese, the US Navy had discovered the Japanese MI plan by breaking the Japanese cipher and had prepared an ambush using its three available carriers, positioned northeast of Midway.[65]

One of Akagi's torpedo bombers was launched to augment the search for any American ships that might be in the area.[Note 3] The carrier contributed three Zeros to the total of 11 assigned to the initial combat air patrol over the four carriers. By 07:00, the carrier had 11 fighters with the CAP which helped to defend the Kido Butai from the first US attackers from Midway Island at 07:10.[67]

At this time, Nagumo's carriers were attacked by six US Navy Grumman TBF Avengers from Torpedo Squadron 8 (VT-8) and four United States Army Air Forces (USAAF) B-26 Marauders, all carrying torpedoes. The Avengers went after Hiryū while the Marauders attacked Akagi. The 30 CAP Zeroes in the air at this time, including the 11 from Akagi, immediately attacked the American aircraft, shooting down five of the Avengers and two of the B-26s. One of Akagi's Zeroes, however, was shot down by defensive fire from the B-26s. Several of the Marauders dropped their torpedoes, but all either missed or failed to detonate. One B-26, piloted by Lieutenant James Muri, strafed Akagi after dropping its torpedo, killing two men. Another, after being seriously damaged by anti-aircraft fire, did not pull out of its run, and instead headed directly for Akagi's bridge. The aircraft, either attempting a suicide ramming, or out of control due to battle damage or a wounded or killed pilot, narrowly missed crashing into the carrier's bridge, which could have killed Nagumo and his command staff, before it cartwheeled into the sea.[68] This experience may well have contributed to Nagumo's determination to launch another attack on Midway, in direct violation of Yamamoto's order to keep the reserve strike force armed for anti-ship operations.[69]

At 07:15, Nagumo ordered the B5Ns on Kaga and Akagi rearmed with bombs for another attack on Midway itself. This process was limited by the number of ordnance carts (used to handle the bombs and torpedoes) and ordnance elevators, preventing torpedoes from being struck below until after all the bombs were moved up from their magazine, assembled, and mounted on the aircraft. This process normally took about an hour and a half; more time would be required to bring the aircraft up to the flight deck, warm up and launch the strike group. Around 07:40, Nagumo reversed his order when he received a message from one of his scout aircraft that American warships had been spotted. Three of Akagi's CAP Zeroes landed aboard the carrier at 07:36. At 07:40, her lone scout returned, having sighted nothing.[70][Note 4]

Akagi (right, partially obscured by clouds) takes evasive action during an aerial attack by US B-17s shortly after 08:00 on 4 June 1942. The trailing ship at left is probably the carrier's plane guard destroyer, Nowaki. The photograph was taken from one of the attacking B-17s.[72]

At 07:55, the next American strike from Midway arrived in the form of 16 Marine SBD-2 Dauntless dive bombers of VMSB-241 under Major Lofton R. Henderson.[Note 5] Akagi's three remaining CAP fighters were among the nine still aloft that attacked Henderson's planes, shooting down six of them as they executed a fruitless glide bombing attack on Hiryū.[74] At roughly the same time, the Japanese carriers were attacked by 12 USAAF B-17 Flying Fortresses, bombing from 20,000 feet (6,100 m). The high altitude of the bombers gave the Japanese captains enough time to anticipate where the bombs would land and successfully maneuver their ships out of the impact area. Four B-17s attacked Akagi, but missed with all their bombs.[75]

Akagi reinforced the CAP with launches of three Zeros at 08:08 and four at 08:32.[76] These fresh Zeros helped defeat the next American air strike from Midway, 11 Vought SB2U Vindicators from VMSB-241, which attacked the battleship Haruna starting around 08:30. Three of the Vindicators were shot down, and Haruna escaped damage.[77] Although all the American air strikes had thus far caused negligible damage, they kept the Japanese carrier forces off-balance as Nagumo endeavored to prepare a response to news, received at 08:20, of the sighting of American carrier forces to his northeast.[78]

Akagi began recovering her Midway strike force at 08:37 and finished shortly after 09:00.[79] The landed aircraft were quickly struck below, while the carriers' crews began preparations to spot aircraft for the strike against the American carrier forces. The preparations, however, were interrupted at 09:18 when the first American carrier aircraft to attack were sighted. These consisted of 15 Douglas TBD Devastator torpedo bombers of VT-8, led by John C. Waldron from the carrier Hornet. The six airborne Akagi CAP Zeroes joined the other 15 CAP fighters currently aloft in destroying Waldron's planes. All 15 of the American planes were shot down as they attempted a torpedo attack on Soryū, leaving one surviving aviator treading water.[80]

Shortly afterwards 14 Devastators from VT-6 from the carrier Enterprise, led by Eugene E. Lindsey, attacked. Lindsey's aircraft tried to sandwich Kaga, but the CAP, reinforced by an additional eight Zeros launched by Akagi at 09:33 and 09:40, shot down all but four of the Devastators, and Kaga dodged the torpedoes. Defensive fire from the Devastators shot down one of Akagi's Zeros.[81][82][Note 6]

A group photo of the American dive bomber pilots of VB-6 from Enterprise, three of whom fatally damaged Akagi. Richard Best is sitting in the center of the front row. The other two who attacked Akagi with Best were Edwin J. Kroeger (standing, eighth from the left) and Frederick T. Weber (standing, sixth from the right).[84]

Minutes after the torpedo plane attacks, American carrier-based dive bombers arrived over the Japanese carriers almost undetected and began their dives. It was at this time, around 10:20, that in the words of Jonathan Parshall and Anthony Tully, the "Japanese air defenses would finally and catastrophically fail."[85] Twenty-eight dive bombers from Enterprise, led by C. Wade McClusky, began an attack on Kaga, hitting her with at least four bombs. At the last minute, one of McClusky's elements of three bombers from VB-6, led by squadron commander Richard Best who deduced Kaga to be fatally damaged, broke off and dove simultaneously on Akagi. At approximately 10:26, the three bombers hit her with one 1,000-pound (450 kg) bomb and just missed with two others. The first near-miss landed 5–10 m (16–33 ft) to port, near her island. The third bomb just missed the flight deck and plunged into the water next to the stern. The second bomb, likely dropped by Best, landed at the aft edge of the middle elevator and detonated in the upper hangar. This hit set off explosions among the fully armed and fueled B5N torpedo bombers that were being prepared for an air strike against the American carriers, resulting in an uncontrollable fire.[86][Note 7]

At 10:29, Aoki ordered the ship's magazines flooded. The forward magazines were promptly flooded, but the aft magazines were not due to valve damage, likely caused by the near miss aft. The ship's main water pump also appears to have been damaged, greatly hindering fire fighting efforts. On the upper hangar deck, at 10:32 damage control teams attempted to control the spreading fires by employing the one-shot CO₂ fire-suppression system. Whether the system functioned or not is unclear, but the burning aviation fuel proved impossible to control, and serious fires began to advance deeper into the interior of the ship. At 10:40, additional damage caused by the near-miss aft made itself known when the ship's rudder jammed 30 degrees to starboard during an evasive maneuver.[89]

Shortly thereafter, the fires broke through the flight deck and heat and smoke made the ship's bridge unusable. At 10:46, Nagumo transferred his flag to the light cruiser Nagara.[Note 8] Akagi stopped dead in the water at 13:50 and her crew, except for Aoki and damage-control personnel, was evacuated. She continued to burn as her crew fought a losing battle against the spreading fires.[92][Note 9] The damage-control teams and Aoki were evacuated from the still floating ship later that night.[96][Note 10]

At 04:50 on 5 June, Yamamoto ordered Akagi scuttled, saying to his staff, "I was once the captain of Akagi, and it is with heartfelt regret that I must now order that she be sunk."[98] Destroyers Arashi, Hagikaze, Maikaze, and Nowaki each fired one torpedo into the carrier and she sank, bow first, at 05:20 at 30°30′N 178°40′W. Two hundred and sixty-seven men of the ship's crew were lost, the fewest of any of the Japanese fleet carriers lost in the battle.[98][Note 11] The loss of Akagi and the three other IJN carriers at Midway, comprising two thirds of Japan's total number of fleet carriers and the experienced core of the First Air Fleet, was a crucial strategic defeat for Japan and contributed significantly to Japan's ultimate defeat in the war.[100] In an effort to conceal the defeat, Akagi was not immediately removed from the Navy's registry of ships, instead being listed as "unmanned" before finally being struck from the registry on 25 September 1942.[101]