Deep Fear

A space capsule from Project Mercury , presumed lost for forty years crashes into the Pacific Ocean . A US Navy submarine picks up the capsule and brings it to the Big Table, an underwater research facility. Four months later, Emergency Rescue Service member John Mayor, recently transferred to run safety drills and currently suffering from a cold, investigates with his submersible pilot Mookie after contact is lost with the submarine's crew and crashed into the Big Table's Navy area, revealed to be due to crewmembers mutating into hostile monsters. John and Mookie picks up Gena Wiseberg, a researcher alongside her pet chimpanzee Anthony, and a sick officer of the submarine before the submarine fell into a chasm.

The submarine officer later transforms after John disembarks and kills Mookie, sinking the submersible. The infection spreads onto the Big Table, mutating both the living and dead into monstrous creatures. Wiseberg discovers that Mayor's cold is preventing him from being infected. Under orders from the Big Table's controller Clancy Dawkins, Mayor works with both other survivors and a SEAL team to contain the infection.

Their efforts, and the impact of the creatures, slowly cripples the Big Table. The rest of the Big Table's personnel, including the SEAL team, are ultimately either mutated or killed aside from Mayor, Wiseberg and Dawkins. Dawkins, unhinged by events, attempts to escape in the remaining submersible but dies to a stowaway creature. Mayor and Wiseberg decide to detach the Navy area of the Big Table and use the moon capsule to reach the surface.

The Big Table self-destructs, flipping over the Navy area. As Mayor tries to restore communications, Mayor learns that the Wiseberg was conducting tests within the Big Table, supervised by Dawkins. Wiseberg reveals that Anthony is the source of the infection, having contracted radiation-mutated bacterium created during his forty years stuck within the space shuttle. Wiseberg hoped that the experiments with the mutated bacteria allows advancements in technologies related to deep space travel and hibernation, while Dawkins hoped the project would allow him to return to Washington, having been exiled to the Big Table after a submarine accident.

Mayor attempts to kill Anthony, which triggers Wiseberg's mutation into first a monstrous and then an angelic form. Mayor sets off the Navy area's self destruction sequence and uses the capsule to escape. When Anthony tries to follow, the defeated Wiseberg holds onto him, both dying when the Navy area self-destructs. Mayor, together with an uninfected dog, are rescued by the Navy.