The scientists had already done a scan using ultrasound or something similar few years back and it was confirmed that its existence is not plausible. Still, throughout history there are always individuals claiming to have seen it, probably either that they mistook something else (eg. a floating log) or they did it for money/fame. (the Loch Ness myth has generated millions in tourism)
From: BigFate
I went there once, didn't see the monster though :( but it is a nice place and the lake is huge. I doubt it exits, unlike ghosts I know they exist because I have seen one. Anyone else like reading the comments of these yahoo blogs… some of them are quite funny!
If you had seen one, then it isn't a ghost.