I understand why everyone is upset with this documentary, but generalized statements like "they are all fubar" and "lucky they are not all dead" is a little harsh and judgmental.
All film makers, whether fiction or non tend to glorify the subject of their films, lets put that aside.
Kieran McKay and Pete Hobson are two of the most experience cave divers in NZ, plus this expedition was 10 years ago. Who could afford to haul in enough O2 and Helium bottles miles from nowhere to last as long as they planned their expedition? They were lucky enough to get a compressor onsite.
If Dave Weaver had not died, then this discussion would probably have a differnet tone, but he did and it is his own fault, not the expeditions.
Here is a little more reading for anyone interested in learning how reckless Dave was
http://nzcaver.org/htg/articles/pearse.htm
These guys were pioneers and groups continue to dive the Pearce Resurgence.
Here is a ton of info about the Pearce
http://www.deepdiving.net/index.html
And remember the first person to touch the Andrea Doria was on a single 72 Steel tank breathing air, I don't hear everyone calling Peter Gimble crazy, cluster etc.... Gary Gentile, John Chatterton, Richie Kohler, etc... all dove and penetrated the Doria on air, why not the harsh critism on these guys? People died on these trips, but I don't hear the crowds disecting the plans, equipment and/or responses to these incidents?
I like to give the benefit of the doubt until I can acquire enough information to judge, I do not believe the National Geographic Documentary provided enough info.
I for one would not take such risks, other people love the risk and live or die with the consequences. If it wasn't for people pushing the limits what kind of advances would we make?