Mailing List Archive Mailing List Archive
> I am concerned about the problem that might arise when switching from > a bottom trimix/heliox to a ascent travelmix of air. > For the sake of it let`s say I dive on a bottom mix 50%He/10%O2/40%N2 to 80m. > I want to switch back to air as early as possible to preserve the bottom mix. > I might want to do this at 55m. My problem is then that the bottom mix END > will be reduced to approx. 22m, I will in practice go straight to an END of > 55m in a very short time. > I do belive this situation may be different from a controlled slow decent to > 55m. > A friend of mine reported dizziness and also knew of other instances where > divers felt uncomfortable at deep switches. I do not know if there is a > great danger of N2 hit, but would be very grateful for comments from you guys! I've been told that this can be a problem when switching from heliox to air at 130' or more, but I've never noticed it as a problem when switching from trimix to air (but then again, I used to use fairly high ENDs on my trimix dives). I felt it once when switching to air at 130 feet from heliox on a rebreather. I didn't get dizzy, but felyt a wave of "warmth" go over my body over the course of 3 or 4 breaths. Aloha, Rich Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]