The crew of an experimental underwater nuclear base are forced to struggle for their lives when their explorations disturb a creature who threatens to destroy their base.
A pretty standard B-movie SF horror where the characters get killed one by one and only the happy couple we met in the first scene survives. Not a spoiler because you could guess that from the start if you know anything about stories. That said, I enjoyed it as the acting was good, the characters were a varied bunch and the monster was kept mysterious until near the end. The thrills kept coming. A good one to watch on Friday night with beer and popcorn.