Collision of the Aquarius

It aired November 4, 1972.

A malfunctioning cargo submarine crashed into the side of the Seamount and its damaged nuclear reactor threatens Sealab, forcing an evacuation. The oceanauts race against time to prevent the submarine’s reactor from melting down, but complicating the situation is its commander, who has an acrimonious history with Captain Murphy.

The episode was re-dubbed by the Sealab 2021 voice cast and was made into the episode “7211”.