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A test submarine carrying a load of experimental fuel is disabled and lying on the ocean floor. The Seaview is sent to recover the volatile fuel canisters but an enormous underwater spider threatens to destroy them.
Everyone but Nelson and Crane are removed from the Seaview and replaced by 8 civilians to test new equipment. One of them is a foreign agent who wants to kill everyone on board and use the ship to provoke an incident and start a war..
While Adm. Nelson is away, Capt. Crane tries to prevent Dr. Borgman from implanting human DNA into marine animals to create a new type of undersea creature.