First about the bottomgas in a twin12: that depends on the consumption rate of the diver and the diveplan. I can do 17 minutes of bottomtime at 110m and still have a 100 bar left when I surface. So with students I plan mostly 15 minutes at 100m. That is mostly doable.
For a bounce it is doable. But I won't go in the tunnel at Dotty from 100-106m depth, as it is still overhead and oc you don't have any time to fix something at such depths.
If it is a bounce, a PO2 of 1.4 is ok. In warm waters I also do it. In cold waters I prefer to stay at 1.3 if I do bottomtime. To lower this to 1.0 or so makes the deco too long. END can be for me personally till 45m. But a 12/60 or 12/65 is for most people perfect and fits within the END limits of agency standards.
As travelgas I prefer a 21/35 and switch around 57m. Can be 54 or such a thing.
Then I personally move over a 40% oxygen, with some helium, so a 40/15. Why? Can be switched at 30m. Last gas ean80 or 100%. It is not the cns, but the gasreserve that makes you to choose or waves. I don't see ean80 as a stroke gas. On long oc deco's, it can be an advantage not to do airbreaks.
I dive 40/80 buhlmann.
But TS, have you done a full trimix course? Was a 100m dive not discussed? What was your deepest dive till now?
For a bounce it is doable. But I won't go in the tunnel at Dotty from 100-106m depth, as it is still overhead and oc you don't have any time to fix something at such depths.
If it is a bounce, a PO2 of 1.4 is ok. In warm waters I also do it. In cold waters I prefer to stay at 1.3 if I do bottomtime. To lower this to 1.0 or so makes the deco too long. END can be for me personally till 45m. But a 12/60 or 12/65 is for most people perfect and fits within the END limits of agency standards.
As travelgas I prefer a 21/35 and switch around 57m. Can be 54 or such a thing.
Then I personally move over a 40% oxygen, with some helium, so a 40/15. Why? Can be switched at 30m. Last gas ean80 or 100%. It is not the cns, but the gasreserve that makes you to choose or waves. I don't see ean80 as a stroke gas. On long oc deco's, it can be an advantage not to do airbreaks.
I dive 40/80 buhlmann.
But TS, have you done a full trimix course? Was a 100m dive not discussed? What was your deepest dive till now?