Uchuu Kaizoku Captain Herlock EP13 - Witch Castle in the Sea of Death

The Arcadia heads back to Earth to investigate a third signal being emitted from the Sargasso Sea. There, the witch Aman, who was waiting for the Arcadia, wages an attack using a 1945 Imperial Japanese naval ship. Harlock, curious as to how this phenomenon occurred, sets off to investigate at the bottom of the sea