TRINITY'S 3rd annual 2012/2013 icing challenge

[DetectorGuy]

I typically use a 80 CF alum, but that limits me to about 50 to 60 minutes per dive. If I know in advance I am going to want longer bottom time (or if all my 80's are empty) I use a steel HP 120. It seems like a 3500+ PSI in a 120 lasts a longer time in the cold water for some reason. Maybe a small portion of that is the mammilian dive reflex.