The Kirby-Morgan KM 48 Supermask is unique, in that the airspace for the eyes is completely separate from the mouth area, and the mask can be worn as a half mask by leaving off the mouthpiece pod, which holds the demand valve or rebreather mouthpiece. This allows bailout to a standard scuba demand valve with mouth grip, but also allows the diver to carry bailout gas fitted to a second pod, which can be clopped to the mask when the primary pod has been unclipped. This can be done underwater, and as there is a standard mouthpiece inside the pod, breathing can commence before the pod is fully connected and sealed. The pod can be cleared of water after sealing, and the eye-space is not affected by the switch. A final alternative sometimes used by recreational divers, is to bail out to a standard demand valve by removing the full face mask completely, and then fitting a backup half mask.