Tamahoko Maru

In 1944, Tamahoko Maru became one of the major Hellship disasters of the Pacific War. A Japanese transport carrying Allied prisoners of war from Java to Japan, it sailed in June 1944 as part of a convoy moving north through East Asian waters. On 24 June 1944, near the Koshiki Straits southwest of Nagasaki, the unmarked ship was torpedoed and sunk by the American submarine USS Tang, whose crew had no way of knowing that Allied POWs were aboard. Public sources agree that 772 Allied POWs were on the ship and that the loss of life was catastrophic, making Tamahoko Maru one of the deadliest POW transport sinkings of 1944.

The Ship

Tamahoko Maru was a Japanese army transport ship used in wartime convoy service. CombinedFleet identifies it as an Imperial Japanese Army transport and traces its earlier prewar life before its wartime employment by Japan’s military transport system. By mid-1944 it had become part of the larger network used to move Allied POWs from Southeast Asia to labor destinations in Japan. Like other Hellships, it was not marked to show that prisoners of war were aboard, even though it was traveling through waters threatened by Allied submarines.

The Voyage

Public sources indicate that Tamahoko Maru was carrying 772 Allied POWs from camps at Batavia, Java, including 42 American POWs, along with Japanese troops and other convoy traffic moving toward Japan. CombinedFleet’s convoy-related records show Tamahoko Maru as part of a broader June 1944 POW movement that also involved other ships carrying Allied prisoners. The voyage formed part of Japan’s larger POW labor transport system, which moved already weakened prisoners from Southeast Asia to industrial and labor camps in the Japanese home islands.

The Attack or Loss

On 24 June 1944, USS Tang attacked the convoy near the Koshiki Straits, about 40 miles southwest of Nagasaki. CombinedFleet records that Tamahoko Maru was torpedoed and sunk there, while POW Research Network Japan lists the ship among the sunken Japanese vessels carrying Allied POWs in transit. Because the ship was unmarked, the submarine had no way of distinguishing it from any other Japanese military transport. The sinking became one of the most serious POW transport losses in waters close to Japan itself.

Casualties and Survivors

The broad casualty picture is clear, although some public sources emphasize different totals. The POW Research Network Japan page identifies Tamahoko Maru as one of the Allied POW transport sinkings, while the Imperial War Museums Maru Ship FEPOW Casualties memorial gives 560 casualties for the ship. The convoy-related CombinedFleet records consistently state that 772 Allied POWs were aboard. Taken together, these sources show that Tamahoko Maru suffered very heavy POW losses, with several hundred men killed in the sinking and aftermath. Because public summaries may count only POWs, or may differ in whether they include later deaths, the safest wording for the page is that 772 Allied POWs were aboard and about 560 were lost.

Legacy and Memorialization

Tamahoko Maru is important in Hellship history because it illustrates the lethal reach of Japan’s POW transport system even on routes close to the home islands. The ship carried prisoners from Java all the way north toward Japan, showing how far Allied POWs could be moved for labor under brutal conditions. Its loss is remembered in FEPOW memorial traditions, including the Maru Ship FEPOW Casualties memorial recorded by the Imperial War Museums, where Tamahoko Maru is listed with its casualty figure. Today, the ship remains part of the wider memorial and research effort to document the names, routes, and fate of Allied prisoners transported in unmarked Japanese ships.

Sources

  • POW Research Network Japan, Tamahoko Maru.

  • CombinedFleet, TAMAHOKO MARU Tabular Record of Movement.

  • CombinedFleet convoy references noting 772 Allied POWs from Batavia, including 42 Americans aboard Tamahoko Maru.

  • Imperial War Museums, Maru Ship FEPOW Casualties memorial listing.

Related pages

  • Jun’yō Maru

  • Hōfuku Maru

  • Rakuyō Maru

  • Kachidoki Maru

  • Hellships Casualty Database

  • Hellships Survivor Records

  • Hellships Research Center