IDA71

On the front of the harness of the navy frogman version there is a projecting metal plate intended to carry a limpet mine.

The loop of each breathing tube can be strapped down to the shoulder to keep it under control to stop it from catching on things or being easily grabbed from behind.

[1] This mode gives the set more duration underwater, but is dangerous and not to be risked by civilians because of the explosively hot reaction that happens if water gets on the potassium superoxide; whereas ordinary modern diver's rebreather absorbents have been designed to avoid producing a caustic solution (commonly called "cocktail") if they get wet.

Filling both canisters with soda lime and putting a second oxygen cylinder in the empty space at the bottom, might increase its dive duration to 8 hours.

A number of IDA71's have found their way out of the ex-USSR to Europe and America, where recreational divers have added a wing buoyancy compensator and converted them into manually controlled closed circuit rebreathers.