dinsdale wanted in on the objection. he went in there.nequivocal moving film of the object. >> on his fourth day at the lake, tim captures what thousands before and since have tried and failed to film. >> he described it as for all well being like the back of an african buffalo. same color tone. quite an enormous, quite a large object. as i say, several feet wide. several feet out of the water. with sort of a reddish brown hide. as he watched this thing, it suddenly took off, he suddenly realized, suddenly remembered, of course, why he was there. and then he started filming. >> is this the elusive loch ness monster finally caught on camera? >> well, that's the perennial question, isn't it? that's the $64,000 question. he really didn't know what it was he'd filmed. >> for 50 years this grainy, 62-second film has captivated the world. >> it was analyzed by the royal air force in 1965. and they measured the object. you can see in the film. and they say it's six feet wide across, five feet high out of the water. it moves up to ten miles per h