Voyage to the Bottom of the Sea : The Secret of the Loch (1965)
Directed by Sobey Martin
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Synopsis by Bruce Eder
Nelson discovers the scientific team that he was supposed to meet in Scotland has been killed, apparently in an encounter with the Loch Ness monster. Using a secret underground conduit, the Seaview journeys to the renowned body of water to investigate. They find something far more nefarious than any creature, mythical or otherwise, including a threat to the Seaview itself.