Quote:
| Originally Posted by Mark Chase CNS clock is more of a concern than getting bent. Repetitive dives on constant high PP02 can really set that clock ticking 
Residual nitrogen loading can be avoided by using a lot of helium. You can end up getting out of the water with less nitrogen in your system than when you got in.
Residual helium is being off gassed very efficiently by air as there is no He in the air we breath so a massive gradient to the Helium for off gassing.
Consideration would be for damage done to tissues on the first dive by aggressive deco or fast ascents. This damage will have no time to sort its self so jumping in again will increase the risk in such cases.
To avoid this do soft deco.
I have done a 90m two and a half hour dive in the morning and a 30iss for 90mins in the afternoon. I have also done a 50-60 in the morning and a 30-40 in the afternoon on several occasions.
Biggest consideration is not pissing of the OC divers too much by doing two very long dives
ATB
Mark |
We have run a fair few plans and looked at the CNS side of it and the % drops a fair bit after a 2 hour SI. also Mark i would agree with the point of if you had any problems on the first dive such as a fast part on the acsent then you potentially could have problems on a second then it would be wise to stay on the boat and not to push your luck.
when you say "soft deco" do you mean pad it out ?
As for pissing off the oc guys they can enjoy the lovely sunshine that will be on offer
Regards
Dave..