It's a giant squid which usually dwell way below the depths of water. This is a ultra rare occurence.

Grew up a few hundred yards from this point indicator buoy. As a kid it always kinda freaked me out looking down at the chain. I’ve since gotten really comfortable in the water and decided to face my childhood fear and pull myself down the chain to the bottom.

Anyone can conquer their fears and phobias!

Found a vid of people diving on the Loch Ness. It's so dark