DeepStar Six

Far below the surface of the unforgiving sea, the daring crew of Deep Star Six are explorers in a forbidding world of impenetrable darkness and unimaginable pressure. They have invaded the icy fathoms into which no human has ever ventured. Their mission is to establish a top secret Navy base on the ocean floor. But something's down there and the crew of Deep Star Six are about to make a startling discovery--there's no escape from the terror of the deep. (official distributor synopsis)