Underwater Noise at North Beach?

This is a question that maybe the military community could shed some light on:

Several times while surfing/bodysurfing near Dog Beach I notice rapid percussion in the water. If you are sitting on your surfboard you can feel it like a tapping on the bottom of your board, or if swimming, they can be felt inside your body. Put your head underwater and you can hear it, like distant machine gun fire or jack hammering. Short bursts of 5-10 pops. It doesn't seem like the noise would transfer well from the air and into the water, especially when there is no noticeable sound above the water.

Perhaps some cool underwater machine gun training?

Tags: community, military, people, sports

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Comment by Jeanette C Aguilar on August 20, 2012 at 9:03am: I would love to know what it is.

Comment by michael daniel shourds on August 20, 2012 at 11:19am: navy ???

Comment by michael daniel shourds on August 20, 2012 at 11:24am: If I knew they have to kill me so I keep quit

Comment by Pamela McCollum on August 20, 2012 at 12:30pm: Underwater demolition practice??? I heard lots of gunfire and explosions early the other morning.

Comment by Brendan Prout on August 20, 2012 at 2:04pm: There's a firing range up the beach on base. Could very easily be noise being transferred from that along underwater.

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