This place is on my tour, love it. Hoping to take a group up there for midsummer.

I heard they found cup and ring marks under the water of the loch there, nothing on their page but the dugout they found is interesting.

http://www.crannog.co.uk/docs/underwater_archaeology/underwater_archaeology.html

http://www.channel4.com/history/microsites/T/timeteam/2004_lochtay.html
http://www.bbc.co.uk/history/archaeology/excavations_techniques/marine_01.shtml