There is the method to test it consisting of taking a breath at the surface, wearing loads of lead, going down to 7m rapidly by dumping the wing then at the bottom fully inflating the wing (dual bladder even better) while at same time dumping that weight.
And yes its really really hard (likely impossible) to breach entirely. Best ive seen is up to the waist. The sheer drag of water prevents enough inertia or speed from being gained to do any more.
Oh yeah and for me, missed deco means im going back down to try to clear it and NOT staying sat on the boat just waiting for the bend to happen.
A dual bladder wing cannot be inflated any more than a single bladder wing. Think real hard about that