The LNPIB Sonar Study (1967-8)
Mystery Casebook Professor DG Tucker, chairman of the Department of Electronic and Electrical Engineering at the University of Birmingham, England, volunteered his services as a sonar developer and expert at Loch Ness in 1968. The gesture was part of a larger effort helmed by the Loch Ness Phenomena Investigation Bureau (LNPIB) from 1967-1968 and involved collaboration between volunteers and professionals in various fields. Tucker had chosen Ness as the test site for a prototype sonar transducer with a maximum range of 800 meters.

The device was fixed underwater at Temple Pier in Urquhart Bay and directed towards the opposite shore, effectively drawing an acoustic 'net' across the width of Ness through which no moving object could pass undetected. During the two-week trial in August, multiple animate targets six meters (20 ft) in length were identified ascending from and diving to the loch bottom. Analysis of diving profiles ruled out air-breathers because the targets never surfaced or moved shallower than midwater. A brief press release by LNPIB and associates touched on the sonar data and drew to a close the 1968 effort:

The answer to the question of whether or not unusual phenomena exist in Loch Ness, Scotland, and if so, what their nature might be, was advanced a step forward during 1968, as a result of sonar experiments conducted by a team of scientists under the direction of D. Gordon Tucker... Professor Tucker reported that his fixed beam sonar made contact with large moving objects sometimes reaching speeds of at least 10 knots.

He concluded that the objects are clearly animals and ruled out the possibility that they could be ordinary fish. He stated: "The high rate of ascent and descent makes it seem very unlikely that they could be fish, and fishery biologists we have consulted cannot suggest what fish they might be. It is a temptation to suppose they might be the fabulous Loch Ness monsters, now observed for the first time in their underwater activities!"

Source & References:

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

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