It just amazes me to hear stuff like this. If you were sailing a little 19' sloop right over six blasting caps in 10-12' feet of water, and they all went off simultaneously, odds are you wouldn't even know it. Sheesh. It would be unpleasant to be in the water swimming or diving near them if they popped, but only because of the way noise propagates in water.
just a harnessbull getting in some facetime :)