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- TV Show Ended -
There is no Next Episode of Secret Beneath the Sea planned.
Kurt Swendler, having escaped the authorities, demonstrates the wonders of Phoenicium, a wonder metal. A mysterious man called Smith is after its secrets, but Swendler passes the sample, and his research notes, to science journalist Mark Bannerman and his assistant Peter Blake.
The plate of Phoenicium is stolen from Bannerman's office. Bannerman, Peter and Janet return to the undersea city of Aegira in search of Phoenicium deposits, but Sir George is on their trail.
Peter is accused of sabotage. He and Janet try to prove his innocence.
Peter and Janet are hauled in front of Captain Payne. Bannerman goes in search of Phoenicium deposits.
Bannerman is missing, following the attack, and there is another explosion at the base.
Can Bannerman frustrate the saboteur and locate the Phoenicium?