Depthcharge

Depthcharge is a black-and-white submarine simulator arcade [video game] released in 1977 by Gremlin Industries. The game shows a side view of a section of ocean with a destroyer on the surface and submarines passing beneath it. The player-controlled destroyer can be moved left and right and drop depth charges to destroy the submarines below.

Gameplay

Up to four submarines may be present at any given time, each of which bears a score for destroying it that increases with its depth. Submarines release mines which the player-controlled ship must avoid by moving out of their path.