Tango Maru

In 1944, Tango Maru became one of the deadliest Hellship disasters involving prisoners of war and Asian forced laborers in the Dutch East Indies. A Japanese transport sailing from Surabaya, Java, toward Ambon, it carried thousands of people, including Javanese romusha, Japanese troops, and Allied prisoners of war. On 25 February 1944, in waters north of Bali, the unmarked ship was torpedoed and sunk by the American submarine USS Rasher, whose crew had no way of knowing prisoners were aboard. Public historical sources indicate that the loss of life was enormous, making Tango Maru one of the major POW transport tragedies of the war.

The Ship

Tango Maru was a cargo ship that had originally been built in Germany and later entered Japanese wartime service after being salvaged and reconditioned in the Dutch East Indies. By 1944 it was operating as a Japanese military transport. Like other Hellships, it carried POWs and laborers without markings that would have identified their protected status to Allied naval forces. That failure to mark the ship exposed everyone aboard to the same danger faced by prisoners on many Japanese transports in contested waters.

The Voyage

According to the POW Research Network Japan, about 3,500 romusha and others were gathered in Surabaya for transport to Ambon aboard Tango Maru. CombinedFleet adds that the ship was carrying about 5,700 troops, including men of the Japanese 3rd Infantry Regiment, together with about 3,500 Javanese romusha and Allied prisoners of war, probably including many indigenous troops of the former Royal Netherlands East Indies Army. This mixed human cargo is one reason Tango Maru is so important in Hellship history: it was not only a POW transport loss, but also a mass-casualty forced-labor disaster.

The Attack or Loss

On the evening of 25 February 1944, USS Rasher intercepted the convoy carrying Tango Maru north of Bali and fired torpedoes. CombinedFleet records that one torpedo struck the ship’s starboard side and that Tango Maru sank within minutes. Because the ship was unmarked, the American submarine had no way of knowing that POWs and forced laborers were among those aboard. The same convoy action also led to the sinking later that night of Ryūsei Maru, producing one of the most destructive paired transport losses in the region.

Casualties and Survivors

Public totals differ depending on whether they count all aboard, only the laborers and POWs, or also the Japanese military passengers. The POW Research Network Japan states that of the 3,500 romusha and others gathered for transport, about 3,000 died. CombinedFleet likewise notes that at least 3,000 people aboard were killed. Because the available public summaries emphasize different groups, the safest wording for the page is that Tango Maru carried thousands of troops, romusha, and POWs, and at least 3,000 people died in the sinking.

Legacy and Memorialization

Tango Maru is important in Hellship history because it highlights a recurring truth often overlooked in narrower POW narratives: many Japanese transport disasters involved not only Allied military prisoners, but also very large numbers of Asian forced laborers. Like Kōshū Maru and Jun’yō Maru, Tango Maru stands as a reminder that the Hellship story reaches beyond Allied national memory alone and includes the suffering of romusha transported under brutal wartime conditions. Its loss is also historically linked to the sinking of Ryūsei Maru, showing how convoy attacks could produce multiple mass-casualty disasters in a single operation.

Sources

POW Research Network Japan, Tango Maru.
CombinedFleet, TANGO MARU Tabular Record of Movement.
Imperial War Museums, The Sinking of Prisoner of War Transport Ships in East Asia.
West Point, List of Hellship Voyages.

Kōshū Maru
Jun’yō Maru
Harugiku Maru
Tamahoko Maru
Hellships Casualty Database
Hellships Survivor Records
Hellships Research Center
Hellships Researcher Guide