The Sherwood Blizzard is excellent. The tip about not breathing the reg till it's submereged is old school, and a great one. The few failures I've seen have been
freeze up's caused by condensation, resulting in a free flowing regulator which
usually freezes to your lip, and Oh, a layer of skin usually comes off with the
reg. Here's a dive in the Detroit River recovering a ships anchor, using twin 72's. The best way to Ice Dive is the other pic, a valve job in a stripmine pit, using surface supplied. I stayed totally dry and wore those clothes, under the suit, to lunch.