Filmmaker Rob Stewart dies off Alligator Reef

[St John the Diver]

You keep banging on about his hypoxia scenario but can you please explain how 2 rebreather divers find themselves with no O2 and no bailout and nothing to breathe except 10/50 dil. This seems like a very far fetched scenario.

Knowing Sotis and his "philosophy" of bailout?

Consume all your 02 on a third dive using the same 2 liter cylinder (as shown in photos of the rigs).

Realize that your bailout gases are really poor choices for your deco obligation on that third dive.

Breathe down your bailout trying to get most of your deco completed.

Try to ascend on the loop because your bailout is gone or nearly so. Might have blown a breath of bailout gas into the loop to start with (50%?) but breathed that down to inadequate PP02 while trying to get onto the boat.

Not too far fetched.

 

[PfcAJ]

You keep banging on about his hypoxia scenario but can you please explain how 2 rebreather divers find themselves with no O2 and no bailout and nothing to breathe except 10/50 dil. This seems like a very far fetched scenario.
Remember that a rebreather diver has as much as 1.3ata in the loop which if you popped to the surface from 70m you would still have 0.16 atm O2 and hypoxia would be the least of your worries.. I just don't see what chain of events could lead to hypoxia without a whole laundry list of screw ups which I doubt given Peter's experience is likely.

They might have had bailout but didn't switch to it since they were on the surface.

Oxygen runs out. Lights go out.

 

[cerich]

Knowing Sotis and his "philosophy" of bailout?

Consume all your 02 on a third dive using the same 2 liter cylinder (as shown in photos of the rigs).

Realize that your bailout gases are really poor choices for your deco obligation on that third dive.

Breathe down your bailout trying to get most of your deco completed.

Try to ascend on the loop because your bailout is gone or nearly so. Might have blown a breath of bailout gas into the loop to start with (50%?) but breathed that down to inadequate PP02 while trying to get onto the boat.

Not too far fetched.

yes, another possible variant of the how for sure.

 

[wedivebc]

Knowing Sotis and his "philosophy" of bailout?

Consume all your 02 on a third dive using the same 2 liter cylinder (as shown in photos of the rigs).

Realize that your bailout gases are really poor choices for your deco obligation on that third dive.

Breathe down your bailout trying to get most of your deco completed.

Try to ascend on the loop because your bailout is gone or nearly so. Might have blown a breath of bailout gas into the loop to start with (50%?) but breathed that down to inadequate PP02 while trying to get onto the boat.

Not too far fetched.

I guess no one here has heard of using your bailout gas in semi closed mode? Plugging in a tank of offboard 50% you have hours of bailout if your loop is intact.

 

[wedivebc]

They might have had bailout but didn't switch to it since they were on the surface.

Oxygen runs out. Lights go out.

And why would 2 guys with hypoxic loops not switch to bailout at the surface. All these scenarios you guys are conjuring are dealt with in CCR 101 and a trained RB diver would not have these issues you are postulating.

 

[cerich]

I guess no one here has heard of using your bailout gas in semi closed mode? Plugging in a tank of offboard 50% you have hours of bailout if your loop is intact.

why do you think they had offboard 50% on them?

 

[cerich]

And why would 2 guys with hypoxic loops not switch to bailout at the surface. All these scenarios you guys are conjuring are dealt with in CCR 101 and a trained RB diver would not have these issues you are postulating.

That makes no sense, if they had extra deco gas they would have used it on deco, not saved it for the roof. who does a gas switch to oc deco gas on the surface?? Who would even train that, it's stupid

 

[uwxplorer]

Is there a sense of how much bailout this team was using?
Most of the discussion seems to assume they had no rich bailout (I am not sure what is called "rich" in S Fl and what size cylinder are used) or that they used it up on deco...
What kind of deco would you expect after a third short dive (10 min bottom time?) at 230 ft using whatever GF these guys are used to, that yo could drain a rich bailout?
If they ran out of O2 and knew it, they WOULD have bailed out, unless they DID NOT have any rich or even normoxic gas to use (or they were hopelessly unaware of the situation).
If they did not run out of O2 during deco but were unknowingly close to that point (who checks their gauges after all?), the hypoxic scenario while staying on the loop at the surface makes sense. A 2l bottle doesn't offer much room for 3 dives that deep...
I don't buy hypercapnia with the rEvo in warm water, assuming they started with scrubbers as recommended (freshly rotated top, new bottom one).
I am not familiar with cases of massive DCS hit after a bounce dive, but would be curious to read about it.
As far as the victim is concerned, his O2 bottle will be drained (CMF) but his computer would have recorded pO2. Count the bailout bottles, case closed.
Tragic any way you look at it.

 

[ScubaAl]

A rebreather diver would be carrying 2 bailout bottles (at least). One for deeper the other shallower depths. So I don't understand why some here keep harping about breathing 10/50 during deco. Ascending from depth the diver would be using no dil. O2 would be added to maintain the set point.
At the point the diver runs out of O2 they would then switch to their bailout for the remainder of deco, gas supply permitting. There is also the option of plugging in there shallow gas to the rebreather via the MAV

Al

Looks like uwxplorer and I are thinking the same thing around the same time

 

[kelemvor]

A rebreather diver would be carrying 2 bailout bottles (at least). One for deeper the other shallower depths. So I don't understand why some here keep harping about breathing 10/50 during deco. Ascending from depth the diver would be using no dil. O2 would be added to maintain the set point.
At the point the diver runs out of O2 they would then switch to their bailout for the remainder of deco, gas supply permitting. There is also the option of plugging in there shallow gas to the rebreather via the MAV

I don't blame you for not reading all 44 pages of this thread. The theory that some put forth was that since this was a bounce dive, they did the whole dive on the loop and did not do a deco stop. Please keep in mind that I'm not a RB diver. I'm just someone who has read the whole thread and I'm doing my best to repeat that particular theory. That it was a bounce dive came from a television interview that someone close to the situation gave. There's many links in this thread to articles on news sites, and a lot of those include interviews.