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Deep oceanographer Dr. Anthony Sterling needs Seaview's help, but his is just one of many requests the Nelson Institute receives every day, and it isn't the most important. Admiral Nelson turns him down – until Sterling reveals that he has discoved a vent that he believes goes straight to the Earth's core. That is exactly the kind of unique research Seaview was built to handle, and Nelson boards her and travels there. But when he arrives, he discovers that the vent has discharged strange elements into the water, causing organisms to grow to enormous size.