Gassed budgie, I'd heard a similar dumping overboard story where commercial fishing nets used to become continually snagged and the offshore area was subsequently avoided. Fishermen never tell lies of course and the snagging net story was told to some who were able to have a bit of a look. Word I heard was whatever was there was relatively intact, something to do with the lack of oxygen at the alleged depths. Notwithstanding, the fisherman was in a bar at the time of telling.