and something just shot across this bay as if a torpedo went through the bay. it was going against the waves. so as it hit each wave, the wave would flash 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 perhaps melded together by the human consciousness by human perception, perhaps 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 exploration in 1987, to submarine searches, and even an exorcism. >> be gone now, hideous demon.