Eventually a body will float after it starts to decay and fills with decomposition gasses. My former congressman’s father was murdered in 1972 and found washed up on the beach a few days later even thouh he was weighted down with concrete blocks.
That's why you puncture the guts etc. a bunch of times, so only bubbles go up. Err, or so I've been told...
“...washed up on the beach a few days later even thouh he was weighted down with concrete blocks.”
Another reason why a wood chipper is a handy tool.
I never go on a killing spree without one.