Kaishinmaru
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- Seiji Akitsu: “Kaishinmaru, do you copy? Get ready to land a big one!”
- Kaishinmaru crew member: “We're taking all the credit for victory.”
- ― Seiji Akitsu radioing the Kaishinmaru moments before Godzilla's arrival (Godzilla Minus One)
The Kaishinmaru (海進丸 Kaishinmaru, lit. "Sea Traveler") is a fictional wooden-hull minesweeper that appeared in the 2023 Toho film Godzilla Minus One. After World War II, the Kaishinmaru was deployed alongside the Shinseimaru to search for and destroy sea mines in Japanese waters.
History
- Godzilla Minus One (2023)
Reiwa era
Godzilla Minus One

Sometime after Japan's surrender to the Allies, the Kaishinmaru, paired with the Shinseimaru, was deployed to search for and destroy sea mines in the Pacific near Japan. The two boats had a cable cutter between them to clip mine wires, making the mines float to the surface.
In May 1947, the Kaishinmaru and Shinseimaru were deployed near the Ogasawara Islands, where they found a capsized American Liberty ship. The two boats were tasked with delaying Godzilla's advance towards Japan until the cruiser Takao could arrive from Singapore, having been returned to Japan to respond to the crisis. Their orders suggested they use the mines that they recovered as weapons and forbade them from telling anyone else about the mission.
Later, dozens of deep-sea fish floated to the surface next to the Shinseimaru. Its captain, Seiji Akitsu, told the Kaishinmaru's crew to get ready for Godzilla's arrival. Kaishinmaru's crew responded that they'd take the credit for killing Godzilla. Moments later, Godzilla grabbed the Kaishinmaru from below and dragged it beneath the waves.
Capabilities
Machine gun
The Kaishinmaru is armed with a single Type 93 13mm heavy machine gun for detonating surfaced mines. An identical gun on the Shinseimaru had no effect on Godzilla, but detonating a mine inside of his jaw succeeded in momentarily incapacitating him.
Wooden hull
The Kaishinmaru's hull is made out of wood to render it immune to American magnetic mines.
Books
- Godzilla Minus One (2023)
Comments
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