Depth Charge Detonation
 

http://www.youtube.com/watch?v=1flVl...elated&search=

"A biology teacher from my school is in the navy. These are the sort of things he gets up to in his spare time!
The black dust is from a sunken WWII barge which they didn't know was there and was filled with 10 tonnes of explosives. They were only trying to clear mines!"