| Hi Ainsley,
I think the biggest problems is going to be gas, especially with a 20min bottom time.
When planning a dive I usually plan for a consumption rate higher then my real average rate. Then you have some contingency if something goes wrong. Is there any contingency in your planned SAC rate?
I would tend to favour a travel gas with some helium and then an additional two deco gases. 32 and 80 as well as 50 and 100 as pairs of deco gases are popular choices although you need to consider CNS loading.
The biggest risk as I see it is loosing one of your deco gasses. You won't have anywhere enough to complete your deco. If you don't have a buddy then you will need a deep safety diver. What's the reasoning for not having a buddy (or two!).
Appologies for all the questions but I believe that if you are going to do a dive then you need to think through the various factors. If I just told you what I would do, it wouldn't really help you. |