open circuit scuba emergency gas supply Bailout to closed circuit rebreather - Switching to an emergency rebreather gas supply Request gas sharing from dive buddy - Request emergency gas sharing from another diver. Switch and isolate regulator in case of freeze - Close off a frozen regulator and switch to an alternative gas supply. Stop and correct runaway dry suit inflation Stop and correct runaway buoyancy compensator inflation Manage dry suit flooding – Manage buoyancy and insulation loss due to flooding of the dry suit Recovery from accidental inversion in dry suit – Avoid uncontrolled ascent following unintended flow of gas to the feet of a dry suit. Follow guideline in silt-out - Avoid getting lost under an overhead Find lost guideline – Avoid getting lost under an overhead Cross break in guideline – Find the guideline on the other side of a break to avoid getting lost under an overhead Emergency ascents – Procedures for reaching the surface in various emergencies Lost mask ascent – Ascent when the diver's vision is impaired by not having a mask. Lost buoyancy ascent – Ascent when the diver's buoyancy is compromised Omitted decompression procedure – Procedures for managing a failure to decompress sufficiently Assisted ascents – Ascents where the diver in distress is assisted by another diver Buddy breathing ascent – Where the divers share gas supplied by one diver using the same demand valve in turns Buddy assisted ascent – Where the divers share gas supplied by one diver using two demand valves Lifeline assisted ascent – Where the diver is pulled up by the line attendant Independent emergency ascents – Where the diver takes independent action and has no assistance Ascent while breathing from the buoyancy compensator – Use of the gas in the buoyancy compensator to facilitate an emergency ascent where no other gas is available to breathe. Buoyant ascent - Using positive buoyancy to rise to the surface Lost weights ascent with flare. – Mitigation of an incident where the diver cannot neutralise positive buoyancy Controlled buoyant emergency ascent – Fine control of buoyancy to ascend at an acceptably safe rate Emergency swimming ascents – Emergency ascent where the diver actively swims upward at approximately neutral buoyancy. Free ascent – Ascent where the diver has no source of breathing gas available Controlled emergency swimming ascent - Ascent where there may be a small amount of breathing gas which