Neither did he use grease and Loch Ness is freshwater so not as buoyant as the sea. In training for Loch Ness, he swam the English Channel three times non-stop, Anyway, he is a professional. Some people do swim in the loch, but rarely for more than a few minutes and it is dangerous because the side-walls are extremely steep. read more
First, it's Loch Ness not "lake loch ness", because loch means lake. Yes, you can, BUT the water is very cold, dark in colour, and gets deep very rapidly as you step away from the beaches. So swimming is quite dangerous and not recommended, except for experienced open-water swimmers. read more