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Show it to the world.
Put it on a popular website, like youtube.
At 3:14 AM on the beach theme, the Loch Ness Monster will show up.
You go show it to Mews. Then he tells you that it's a pair of tires. So then you go back to the Loch Ness and click on the guide. Then you throw a tantrum about how he fooled you for the loch ness monster. He then goes on a vacation.
That would be never. The Loch Ness monster has never been found or even reliably photographed. The person who took the most famous photograph purposing to show the monster admitted a couple of years back that it was fake. The entire thing was a merely a hoax that was dreamed up to increase tourism.
You have to get a submarine ticket, then go to the bottom of the lake and take a picture of the fake Nessy, then show the guys at the Pub, and they will show you a news article. Beat the guy that you see on your way on at darts, and you will get a instrument. Go as far as you can in the lake on the rowboat, then play the instrument. Nessy will come up, and you take the picture.
Not in the loch itselfbut reading the question to mean "Loch Doon area", there may be as there is Carboniferous Limestone in the region, but I recall no references to caves there. The only geological mapI could find was very small-scale generalised one, and didn't even show Loch Doon!
Well scientists are never going to give up and neither will the people who believe to have seen him. But the show that was on it is over so I guess they are done
The Dick Tracy Show - 1961 The Loch Mess Monster - 1.70 was released on: USA: 1961
On your first trip to Loch Ness, you win a rowboat ticket and get a picture of loops in the water. Take it back to Mews, who says it is truck tires. Return to Loch Ness to win a submarine ticket, and while there you can tell off the devious rowboat operator (who leaves). After you show your submarine photo at the pub, you can get a pennywhistle and take the rowboat across the loch (left twice).
The Dick Tracy Show - 1961 The Loch Mess Monster 1-70 was released on: USA: 1961
The first picture, that you get from the rowboat, you don't have to show at the pub -- you have to take it back to Mews. When you return to Loch Ness, you will play the other players for a submarine ticket, and you do bring that photo back to the two men in the pub, because they disprove it immediately as a prop.