Voyage to the Bottom of the Sea : No Way Out (1964)
Directed by Felix E. Feist
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Synopsis by Bruce Eder
Nelson (Richard Basehart) and Crane (David Hedison) are assigned to conduct a top Communist agent to the West, so that he can defect -- but their plan is betrayed and the man they're helping is wounded. He gets aboard, but unbeknownst to all concerned, the enemy has placed a trained assassin aboard to kill the defector -- and anyone who gets in his way.