JW411, Quite correct.
In order to lose pressure you have to have it in the first place.- (ie. cabin is lower than A/C). A cabin that climbs with the A/C is therefore NOT PRESSURIZED and therefore doesn't suffer a de-pressurization.
MOR - to answer your query about 'rubber jungle' - I believe it was one of the manual drop out A/C and therefore the rubber jungle wouldn't have automatically come out at 14000'. presumably it was deployed as part of the drills - don't know what altitude this was done though. - belt and braces
