Here is some interesting reading RumBum.
Hydrogen is being experimented with for extremely deep diving.
http://www.techdiver.ws/exotic_gases.shtml
Trust me, I am no expert and Rick seems to be full of good knowledge.
I found some of this reading to be rather interesting.
Somewhere I was reading that helium is becoming more and more rare and at some point the cost will be prohibitive for divers. There is a lot of research looking at alternitives for the future. If I find the article, I will post it.
Hydrogen is being experimented with for extremely deep diving.
http://www.techdiver.ws/exotic_gases.shtml
Trust me, I am no expert and Rick seems to be full of good knowledge.
I found some of this reading to be rather interesting.
Somewhere I was reading that helium is becoming more and more rare and at some point the cost will be prohibitive for divers. There is a lot of research looking at alternitives for the future. If I find the article, I will post it.