and sells clay models of nessie to tourists. >> the one time i was really blown away by a sighting of something, i was at the other end of the loch at ft. augustus, and something just shot through the bay as if a torpedo went through the bay. and it was going against the wave so, as it hit each wave, it would splash up white water. and there's no simple explanation in loch ness for what that could have been. >> dinsdale's film also inspires marine biologist adrian shine to identify once and for all what lies beneath the surface of lake ness. >> the loch ness monster is an amalgam of many things put together by the human consciousness, by human perception, by human aspiration. we'd all love there to be something there. >> adrian's loch ness project has organized dozens of expeditions from operation deep scan, a 24-boat sonar