. >> kelly nash shows his footage to crypto zoologists who investigate distinct and undiscovered specieshowed the video to was very intrigued by the film. they all agreed that it was something that they've never seen in alaska before. >> when i saw this, i was absolutely flabbergasted. i thought he had come up with one of the greatest finds of the 20th century. >> investigator john kirk is certain kelly nash has caught cad oh camera. >> i said, mate, you've got one of the best pieces of footage of this. >> the craziest footage is the one that kelly nash taped. i've seen ever creature in the water, and i don't know what that was. that's what got us to want to go up and try to find it and figure this out. >> jonathan hillstrand, king crab captain and star of discovery channel's "deadliest catch," believes caddy is a giant sturgeon. he set sail in 2011 hoping to prove his theory. >> the "anchorage daily news," whatever, actually put a $100,000 reward on this thing. so i was thinking about that, too, going wouldn't that be nice if i could bring this baby in. >> but despite an exhaustive sear