Too right Matthieu, sorry about that crap!!
The easy situation is if you are in mid water, drifting with the tide. The Hoola Hoop or the clipped/deflated SMB both work well.
By the way, wisdom has it that you should always endeavour to get back to the shot as it has safety in numbers (of bail-out cylinders). However, if you are at 100m ish or deeper and are say 25m from the shot, you could use all your LHS trimix just to get back to the shot on OC - (Having/grabbing a buddy here would be a distincy advantage and double your gas availability) In this case, the idea is to 'jump' up 30m, then stop / slow the ascent. This allows you to start offgassing and to deploy the yellow smb. It also makes the LHS last longer AND allows you to use your RHS if needed.
The shot is the best place to be for sure, however it has snagging possibilities. The important point is that the skipper can only have one set of procedures for that group. To suit all scenarios, we tell the skipper to drop the deep set first (he can control the boat and launch the drop set from the same position) and clip the carabener to the loop 'positively' onto the smb's strap, collapse it and deploy.
S
