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One tank for dil is fine for me ... after all, you have a level of redundancy in the CCR. You have to break the CCR and lose DIL to be in the shit, i.e., two failures. This one if for Jon, I don't follow your logic in having for DIL ... do you have same level of redundancy in O2 on your CCR...

What bottom time?

On extended trips with deep dives I often run a larger drysuit bottle and then run the wing from that also.

O2 cells are working by diffusion into an electrolyte - The C02 reaction is happening at the surface area of the sorb - it is not the same process? I suspect gas molecules getting in the way do have an effect.

The O2 cells don't filter O2. Deeper you go the more gas there is but the same amount of C02. A filter will struggle more in these conditions.

It’s easy to deploy and and wind in on a scooter - just takes practise, Winding in - you scooter back and use the drag of water to maintain tension on the line and then stop and retrieve the loop. It’s much easier to be shown and very efficient with practise

Why would you shut off O2 - that seems like hypoxia waiting to happen. Also if your unit injects it is because you have changed loop volume (either increase in depth resulting in dil being added) or you have metabolised O2 from loop. For the latter if you vent you are reducing loop volume...

Couldn't disagree more with this - sorry. Racing off the bottom in a bailout situation - good luck! Can you not imagine any situation where you might be delayed? Also, maybe if you dive deeper than 90m you would eventually reach a point where your strategy breaks (for me its already broken at...

Halcyon do a CF backplate - I have had one for 2years and do a fair (200 dives. a year) amount of diving and it looks brand new - why wouldn't it hold up well in seawater?

I have a suex t16 and halcyon version of xk1 - will be more than £1000 unfortunately

60% of not much is still not much.

Sorry Randy - respectfully - I don’t buy it. CCRs are not airplanes. They are more like push bikes. Once you’ve ridden one you can ride any. You just need to make sure you know where and how the brakes/gears work and not take a road bike on a downhill mountain bike route. Even so in the...

Cross overs are a massive con. Ccr is simply a tube, two flexible bags and loop with some electronics. To say that you need another course to swap units I am afraid to say is just the $$$$ talking. What the industry needs is proper instruction where people actually learn key skills (like...

Ross - perhaps you should invest some time in means, mode and median for measures of centrality. They suffer in a similar way to ISS in that they take a data set and give you a single number. Two different data sets may have the same mean but very different modes or medians. In fact it’s...

Ross - why does your list start at 2? Also I think simon is waiting for an answer to his question about super saturation.

coo roo-c'too-coo

Simon - arguing with Ross is like playing chess with a pigeon (it’s not mine and goes along lines of: The pigeon doesn’t understand rules, knocks all the peices over, struts around with chest pumped up like he’s won and then takes a dump on the board), Please just ignore him, use your...

I can’t say what factors caused this but whatever the cause (or solution) it cannot be attributable to decompression shallower (future event) and must be due to previous and therefore deeper decompression. This is purely a review of what happened on this dive and is a single data point - only...

Unfortunately (since it open a door for more stupidity) the one thing you can say is that there was not enough decompression done deep.

1-2 - its true but how much difference does 1-2% inert gas actually make - I doubt enough to be measurable for any dive given all the other variables. 3 - Yet 1.0 vs 1.2 is 20% more as an oxygen dose. I don't think there have been any documented cases of oxygen issues at 1.2 (someone will...