I watched that show a few times, but it was always frustrating, because the main event, was just progressing at a snail's pace. For instance, KILLER QUICKSAND was the featured myth, & it was spread all over the time slot, which was sprinkled with other myths, most of which had no interest to me.
So, they showed that the one guy was buoyant, even though the the big guy pushed him down, he popped up as soon as the pressure was removed. Thus, they concluded that this was indeed a myth, without even a mention of explorers wearing heavy backpacks or other items that would surely deprive them of buoyancy, much less a discussion of such things.
No mention of % of body fat, either.