I don’t know ... how far offshore would they have to go and how would they get there? These poor people don’t own boats. Looking at the map, it would seem that the way Port au Prince is situated, bodies not taken far, far out to sea will just return to a beach quickly. I’m not sure how the currents run off of that portion of Haiti. But you do bring up a good point.
Bodies sunk in deep water don’t come back up. I’m convinced that’s what happened to the American girl on Aruba. The water at depth is too cold to cause gases to form, so the corpses would stay down.
I dont know how far out these poor souls should be buried but a large scow towed five or ten miles off shore might work.