Icy water? The sea temperature is approaching its warmest in August, even at 60 North. Still, cold shock is a player and you have a point.
Nevertheless, the existence of 64 limbs flailing around the water-filled cabin is of far greater detriment to the passenger trying to either escape or deploy their rebreather. If the forthcoming parliamentary visit does not seek to address the root causes behind the necessity for helicopter companies to cram as many passengers as possible into the cabin, then they'll have wasted their journey.