This was on Channel 4 over here last week.
Dont know if you can watch it outside of the UK but following a Cambridge professor recreating the tests that Barnes Wallace did before heading to Canada to test it in real life. They build a mini-eider dam and then see if they can hit it....
My only comment is F me you Canadians are mental....
link to 4OD site for watching:
http://www.channel4.com/programmes/d...-bouncing-bomb