The Battleship Mutsu

Remembering the tragedy

The Japanese battleship Mutsu was a Nagato Class battleship, the first class of dreadnoughts to mount 16-inch main guns. Mutsu was paid for by popular subscription, mostly by donations from schoolchildren. She survived the cuts imposed on the Japanese Navy by the Washington Treaty, and she and her sister Nagato remained the most powerful capital ships in the IJN until the completion of the gigantic Yamato Class battleships.

During WWII Mutsu took part in the attack on Pearl Harbor, the Battle of Midway, and the Solomons Campaign. Around noontime on June 8, 1943, while moored in Hiroshima Bay, Mutsu was suddenly rocked by a violent explosion, which blew the ship in two. The 535-foot forward section rolls over to starboard and sinks immediately, coming to rest upside down in 130 feet of water. The 147-foot aft section upends, and remains floating with the stern pointing up towards the sky. It finally sank 14 hours later at 33-58N, 132-24E, and no doubt many lives were saved by this delay in sinking. Boats from other ships came to the aid of the survivors, rescuing 353 crew members, while 1,121 men lost their lives. Japanese destroyers scoured the bay, but no evidence of Allies submarines or X-craft could be found. Nor do the Allies boast of a victory; loss to enemy action seems unlikely. Visibility at the time of the explosion was poor, but eyewitness accounts indicate a reddish-brown fireball, indicating a magazine explosion. Some claim to have seen smoke in the vicinity of the number three turret just before the explosion. Preliminary findings indicate that the ship was lost to an accident.

The wounded are sequestered in a local hospital, while the rest of the survivors are quickly shipped off to remote outposts across the empire. The Japanese have made a quick decision: the loss of the Mutsu will be covered up, the ship will be salvaged and returned to service as quickly as possible, and the enemy will never know.

Divers are send down to explore the wreck, and are initially unable to locate the aft section. They describe the forward section as being "bent like a nail", but the High Command is insistent: the ship must be raised, towed to drydock, and repaired before word of the loss leaks out. Local commanders are given a ridiculously short deadline of three months, so salvage experts and divers are brought in from all over Japan. Salvage divers are not told what ship they are working on, but quickly figure it out when they are brought on board Mutsu's sister ship Nagato, to familiarize themselves with layout of the wreck.

Eventually,the reality of the situation sets in, and the salvage orders are rescinded. Salvers cut into the hull to recover valuable fuel oil, and then the wreck is abandoned.

Investigations into her loss center on special incendiary shells stored on board, but experiments are unable to cause these shells to explode. Explorations of the wreck rule out an external explosion, eliminating Allied submarines or special forces. After two months of work, the investigators present their report: the explosion was caused by human interference, either by a ring of saboteurs or a disgruntled crewmen in the number three turret who had been recently accused of theft.

A failed salvage attempt in 1949 was followed by extensive salvage operations between 1970 and 1978. Recovered items include part of the bow, the anchors, screws, rudder, main guns, the complete number 4 turret, and personal effects of the crew. The Mutsu Memorial Museum opens in Tôwa Chô, where many artifacts are restored and displayed, while other items go to other museums and shrines.


Mutsu at anchor before the war.



A 16-inch turret breaks the surface during salvage operations



The Number 4 turret is landed to await restoration



The restored Number 4 turret



The Mutsu Memorial Museum



One of Mutsu's screws



Main anchor


The business end of a naval rifle


Another 16-inch weapon on display at the museum


A Japanese AA gun on display- can anyone tell me what it is?


An 8-inch gun inside the museum