The Phantom from 10,000 Leagues (1955)

A marine biologist and a government agent investigate mysterious deaths and rumors of a sea monster in a secluded ocean cove, and find themselves involved with a marine biology professor conducting secretive experiments, international spies trying to steal his secrets, a radioactive light on the sea bottom, and the malevolent thing which guards it.

• female spy
• laboratory
• marine biology
• monster
• mutation
• mysterious death
• nuclear experiment
• pacific ocean
• radioactive corpse
• radioactive light
• row boat
• scientist
• scientist's daughter
• scuba diving
• sea monster
• sheriff
• spear gun
• spying
• underwater
• uranium