Red Satan

Red Satan is a nuclear submarine created by Toho which first appeared in the 1963 Toho film, Atragon.

Atragon
The Red Satan was deployed to find the base of the Mu Empire. It found the Mu Submarine, and followed it under water. The Mu Submarine went too deep for the Red Satan, and it tried to surface. The pressure of the water caused the submarine to collapse and explode.