Submersible Investigations
Mystery Casebook Earlier submersible work had yielded dismal results. Under the sponsorship of World Book Encyclopedia, pilot Dan Taylor deployed the Viperfish at Loch Ness on 1 June 1969. His dives were plagued by technical problems and produced no new data.

The Deep Star III built by General Dynamics and an unnamed two-man submersible built by Westinghouse were slated to sail but never did. It was only when the Pisces arrived at Ness that the LNPIB obtained new data. Owned by Vickers, Ltd., the submersible had been rented out to produce a Sherlock Holmes film featuring a dummy Loch Ness Monster.

When the dummy monster broke loose from the Pisces during filming and sank to the bottom of the loch, Vickers executives capitalized on the loss and 'monster fever' by allowing the sub to do a bit of exploring. During one of these excursions, the Pisces picked up a large moving object on sonar 200 feet ahead and 50 feet above the bottom of the loch. Slowly the pilot closed to half that distance but the echo moved rapidly out of sonar range and disappeared.

Source & References:

http://en.wikipedia.org/wiki/Loch_Ness_Monster

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