This device is a closed circuit rebreather
and is developed in 1962. The device is intended for landing to water with a
parachute and stay on depth up to 20 meters with short-term stay on depth of
30 meters. The device prevents barotrauma lung during the land moment - the
valve which extinguishes gas impact is built in the breathing hoses.
The device can be connected to a stationary circuit of breathing called
Very rare unit used by parachutists. Pure
oxygen rebreather used by russian forces to 20 mtrs!
Photo thanks to Valery Mukhin!
If you have any additional information of
this unit please let me know!