Deep Blue (TurboGrafx-16)

You command an A.N.G.E.L. Fish Attack Sub. Your mission: rid the oceans of the evil aliens in their Undersea Palace deep in the ocean depths. On top the water is calm, beautiful. But as you descend toward the Palace, you won't believe your goggles! Scaled creatures snarl. Swarms of mutant fish attack. Power up! Use the Swirl Cutter! Energy Fin full throttle! Fire! Fire! Be John Paul Jones. Or be Davey Jones. Fire!