The Blue Hole near Belize can be seen from space. It is the largest sink hole on the planet with depth of almost 400 ft. Discovery channel hyped the episode for a couple of weeks but surprise, surprise it wasn't live. Even though half a dozen screens in the "studio" said "LIVE" the Discovery Channel admitted that it was a day old "due to rough sea conditions". It was well known that there is a one of hydrogen sulfide that prevents decay so anything could be down there. Tensions were high as the submersible approached the "death zone" but (spoiler warning) there is nothing down there except silt, dead crabs and beer bottles. All we got was a lecture on global warming, an interview with Costeau grandson, Fabian and an exciting account of a crab falling into the abyss and trying to crawl out.