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A NATO team of the least qualified sea-men (giggle) take the Beatle's submarine down to the depths of the sea and find some icky monsters, hungry starfish and love. Of course they do.
So some might call the Rift a Leviathan and Deep Star Six knockoff, but we see this as much more of an Aliens knockoff, which becomes its fatal flaw. The plot is just so familiar and could take place in space just as easily as it does it under the sea. You've got the expedition into tunnels with an unknown monster patrol ahead. You've got the "military wants the monster for biological warfare" yadda, yadda. You've got the ship breaking down due to sabotage, yadda yadda. It gets tedious just watching Aliens again.