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A Soviet satellite has crashed into the sea and its nuclear reactor must be disarmed before it causes a disaster. Two Soviet scientists come aboard Seaview to carry out the work -- but one of them is an imposter.

Un satélite soviético, que contiene una bomba, cae en el Océano cerca de California. El Seaview transportará a dos científicos rusos que deberán desactivarla. Sin embargo, uno de ellos dificultará la misión.