How to find the Loch Ness monster?
If the monster of Loch Ness is or was real, it is probably dead by now.
So, instead of looking for a live, adult animal, we should be looking for the remains of the monster of Loch Ness. Its skeleton, its bones lying at the bottom of the lake.
According to Wikipedia, the last serious expedition in search of "Nessie", as the monster is called, was done by BBC in 2003 using sonar and satellite trackings (whatever that means...)
But of course sonar is useful only if you are trying to find a large, moving animal. Sonar is useless for small animals or for skeletons lying still at the bottom of the lake.
If the monster of Loch Ness was the last of its kind, and it came from somewhere else, then there would be only one skeleton.
But if there is or there was a community of several animals, then we can expect to find several skeletons of various sizes lying at the bottom of the lake.
I don't know for how long bones would remain preserved underwater. Probably the bottom of a lake is not the best place to preserve a skeleton.
I have heard of perfectly preserved ancient Roman boats found at the bottom of the Black Sea. Apparently they were preserved due to lack of oxygen.
How long can bones last at the bottom of a lake? If the Loch Ness monster of 1933 was real, I believe its bones are probably still there.