Emergency Breathing Systems – short: EBS – provide you with a spare amount of air to get out of a capsized helicopter. The systems are usually attached to life vests. There are three different technologies in use. So called re-breather systems consist of a bag into which the passenger exhales some of his breathing air before the helicopter submerges. This gives them a short term air supply of up to 3 to 5  breaths, critical time to escape the helicopter. The use of this system can be a little tricky, as the system has to be filled immediately before submersion. It cannot be deployed under water. Hybrid systems combine a rebreather bag with a small gas cylinder. The gas is not used as air supply, but to purge water from the system, if the mouthpiece couldn’t be applied correctly before submerging. This way, it becomes deployable under water. Compressed Air-EBS (or CA-EBS) is basically a mini-SCUBA-set. The system provides the user with up to 20 breaths worth of compressed air. The use is simple as it can still be deployed under water. However, due to the pressurized air, risks of barotrauma remain