New crevice could be the hideaway of the creature dubbed 'Nessie'.

A long, humped shape lying at the bottom of a deep undiscovered crevice has turned a boat skipper's doubt into belief.

Tourist sightseeing boat skipper Keith Stewart, 43, claims to have found a crevice large enough for the phantom beast to be hiding in, about nine miles east of Inverness in Loch Ness, The Telegraph reported.

Stewart said he measured the depth of the hole with his sonar device, and it came in at 889 feet (271 metres). Loch Ness is officially recorded at 754 feet deep (230 metres).

"I wasn't really a believer of the monster beforehand," Stewart told The Telegraph.

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"But two weeks ago, I got a sonar image of what looked like a long object with a hump lying at the bottom. It wasn't there when I scanned the loch bed later.

"That intrigued me and then I found this dark shape about half way between the Clansman Hotel and Drumnadrochit which transpired to be a crevice or trench.

"I measured it with our state of the art 3D equipment at 889 feet. I don't yet know how long it is.

"But I have gone back several times over the abyss and I have verified my measurements. It gets deeper from 825 feet to the recorded depth."

The president of Loch Ness Monster Fan Club Gary Campbell wants a submarine to be sent down there.

"Now we've discovered a whole trench that makes the loch nearly 900 feet deep which is twice the depth of the North Sea," he said to The Telegraph.

"There could be more trenches which make it deeper. This looks like where Nessie and her whole family could really hide out and explain why they are rarely seen."