Yeah, its Trimix if you replace some of the nitrogen with helium, and Heliox if you replace all the nitrogen. It has advantages in SOME deep diving situations (not all). It is also a LOT more expensive.
Unsurprising, since Helium is notoriously difficult to produce.
Cuthalion's art is the prettiest art of all the art. Like my avatar.
Number of times Roland St. Jude has sworn revenge upon me: 2