i understand that rapid water "waterfalling" over an obstacle will hold bodies in the swirl below the falls for a very long time. I'm with Ben on finding them "manually."
Ick.
In watching "Sea Hunt" I always cringed when they went into a cave or other tunnel.
I remember the rather graphic descriptions of when they found the Challenger capsule with the bodies in there. Apparently the capsule hit the water at about 200 mph.
Ick.