I thought as much!! I saw Clive on Monday,trying his new scooter. Rick of course amused us all by boasting that the swiss homebuild "could not go wrong with no electronics" then could not use it due to mis-assembly (bad o-ring seating). Highly amusing!!!
Which France trip do you mean, the one coming up shortly, or one of the ones later in the year? I will probably be Rick's only support diver on the forthcoming trip then we'll separate for individual projects for the remainder of the trip. Might well see you later in the year!
Anyway sorry Mark for hi-jacking your thread. I still think CCR in a cave is the best way to learn now, if you are a decent CCR diver then you know and understand the necessities of OC, especially if you practise proper bailout planning already in open water. Most decent wreck divers know and understand what they can achieve on their OC bailout, hence if they switch to cave, there are still those same logistics (albeit more complex) to consider. CCR cave diving with CCR bailout still warrants OC gas in my view, this is another one that's been done to death!!
If divers can't execute a CCR dive with appropriate OC gas planning, they have no business being near water, never mind a cave.
PS - the nano unit's come a long way.