Ice Diving

• How to impact the underside of the surface ice if the diver's weight belt falls off for any reason and the diver ascends uncontrollably and rapidly.
• How to deal with a frozen air-supply system using a redundant back-up system.
• What to do in the event the diver loses contact with the line or the line tender does not get feedback from the diver in response to signals given to the diver.