The unique device SP-5 of Russian army, It allows one to stay underwater to 2 hours without oxygen tanks. It is mainly used for the evacuation of personnel from shallow depths and dive as a device for the special forces underwater.

The device is not used for common recreational diving due to the high cost of chemicals used (about 8.000-15.000 dollars for each fill), and risk assessment in case of water leakage, causing violent reaction in contact with chemicals.