Which do you think is less dangerous at 160ft? Open-circuit air or CCR trimix?

[Mobulai]

If you put in the time and training to go to 60m on air equivalent to the time and training it would take to go to 60m on CCR+trimix your safer on OC.

I think you just described me
(I haven’t done mod2 yet so I would vote OC for my case anyways)

 

[johndiver999]

Not that I know anything about rebreathers, but I would assume that the individual's PERSONAL susceptibility to narcosis at 160 would be of overriding importance. I know that some people just cannot function well on air at 160 feet and other people feel that they can.

Also, training and practice has limited potential to improve the performance of some people at depth on air- I have personally seen evidence of this fact.

 

[ginti]

I think you just described me
(I haven’t done mod2 yet so I would vote OC for my case anyways)

Or vote for skipping

@scottgrizzard in the end, it is a matter of risk tolerance. And calculating the risk involves:
- skills on CCR vs skills OC
- training
- experience
- buddies (if any)

Assuming your skills, training and experience are comparable for OC and CCR (**for this dive**), and your buddies are in a similar situation, go CCR, don't even think about it.

Otherwise - OC might be safer. However, safer doesn't necessarily mean "safe enough" - it really depends on your risk tolerance. I would NEVER do a 50m deep overhead dive in air, and I am not the only one; of course, some people would do it, and as far as they understand the risks, fair enough.

 

[lostsheep]

Obviously anyone that dives a CCR is going to say it’s safer.

If you put in the time and training to go to 60m on air equivalent to the time and training it would take to go to 60m on CCR+trimix your safer on OC.

Most everyone who actually dives CCR has also done a lot of OC dives. Seems to me that these people are the only ones qualified to answer the OP and we are all in agreement that CCR is the way to go. Comments about CCR trying to kill are straight up absurd; the rebreather is literally trying to keep you alive.

What is your CCR experience @Celt ? Are you one of those unicorn divers who don’t get narc’d or maybe you just trained for it?

 

[PfcAJ]

Cave dive without line? Absolutely not.
Cave dive without redundant gear? Veto.
Cave dive without training? Insane.
Cave dive without backup lights? Crazy.
Cave dive past thirds? A madman.

Cave dive on deep air? Well I guess maybe it’s okay if you are comfy with it

 

[Celt]

What is your CCR experience @Celt ? Are you one of those unicorn divers who don’t get narc’d or maybe you just trained for it?

I’ve no experience on CCR and yes I’ve trained for deep air, and I’ve trained every bit as hard and long as people trained on CCR

 

[lostsheep]

I’ve no experience on CCR and yes I’ve trained for deep air, and I’ve trained every bit as hard and long as people trained on CCR

Got it, you have no idea what you’re talking about when it comes to CCR, thanks for clarifying.

 

[Celt]

Got it, you have no idea what you’re talking about when it comes to CCR, thanks for clarifying.

I understand that diving on CCR is inherently more dangerous than OC, if you don’t get some training.

 

[inquis]

I understand that diving on CCR is inherently more dangerous than OC, if you don’t get some training.

True, but the OP posits a comparable level of expertise/training for both.

 

[Celt]

True, but the OP posits a comparable level of expertise/training for both.

But that’s what I’m saying, with equal levels of training a CCR is more dangerous than OC ( with a CCR there’s more chance of a mechanical failure)