DeepStar Six (1989)

IMDB
Genre : Horror, Sci-Fi, Thriller
TRAILER
Director : Sean S. Cunningham
Stars : Taurean Blacque, Nancy Everhard, Greg Evigan, Miguel Ferrer
Plot : A team of navy personnel stationed at a temporary base at the bottom of the ocean and tasked with setting up nuclear missiles discovers a huge underwater cavern which houses a giant prehistoric creature.