naval work diver's breathing set. The "71" in its name may be the year that it was designed, like with the numbers in the names of the AK series of Russian rifles. The name IDA comes from (translit. izoliruyushchiy dykhatel'nyy apparat, literally Insulating/Isolating Breathing Apparatus). Other name is Individual Breathing Apparatus (, translit. Individualniy Dykhatelniy Apparat). In its original Russian mode as an oxygen rebreather, its dive duration is said to be 4 hours. 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. Gallery References External links http://www.therebreathersite.nl/Zuurstofrebreathers/Russian/ida-71.htm information & links http://www.therebreathersite.nl/Zuurstofrebreathers/Russian/photos_ida-71.htm pictures & links https://web.archive.org/web/20120314061648/http://www.smrebreathers.ru/rebreathers/rebreather/time_before_time/boets2.jpg Frogman with IDA71 and APS underwater rifle , , :: Russian frogman displaying on quayside at Sevastopol on Russian Navy Day with IDA71's with fullface masks with oval windows like an ordinary diving mask's, and AK47's or similar. Images of Russian frogmen on land http://sport.freepage.de/rsdas/ Swiss technical Info about IDA71 with pictures http://www.bleilatschen.de/idamania7.htm German Information, use of the device, field report IDA71 Military equipment of the Soviet Union