Deadly Tide

Deadly Tide is a pre-rendered shooter in which the player gets to control a deadly new undersea vehicle. The basic plot behind the game is that the aliens have arrived on Earth, and they are not friendly. They take up residence in the oceans of Earth, and begin to launch attacks on shipping. Plus, they are also slowly raising the level of the oceans, trying to flood humans from the planet. Your mission is to stop them. (mobygames.com)