... I'm quite new at drysuit diving. I was told that the emergency procedure for a runaway ascent is to lift the arms and let the air flow out of the wrist seals. I suppose this won't work if the suit has those zip-seal dry gloves attached, though.

Anyway, I'd be interested in hearing people's experience in using this arm-raising emergency technique. I noticed when I was last diving dry and taking photos that when I would lift the camera to shoot upwards (getting more light) some air did escape from the wrist seals.