Men and ladies take part in separate categories. Total distance is 200 m. At the starting point athletes must be ready on pool curbstones wearing scuba. After start they enter to the water by giant step, descend and start swimming underwater using scuba. At any place, but not later than the mark of 15 m, an athlete should remove his scuba, establish negative buoyancy for scuba and leave it at the bottom. If scuba set has positive buoyancy and swims up, penalty time is 10 seconds.
Athletes continue swimming underwater with the breath hold and can ascend and start free style swimming using mask, snorkel and fins at any moment after crossing the mark of 15 m, but earlier than 15 m from opposite sidewall. An athlete should make a reverse near the pool border and continue free style swimming using mask, fins and snorkel. After an athlete completes the second pool length (total distance is 100 m) he/she makes a reverse and descends underwater with breath hold. An athlete has right for optional stop near the border for breath control before breath hold diving. Then an athlete must swim underwater, reach his/her scuba, start breathing from the regulator and continue swimming underwater, same time replacing and adjusting scuba.
Scuba must be completely replaced and adjusted before 15 m mark from the opposite border, otherwise the penalty time is 10 seconds. An athlete should make a reverse near pool sidewall and continues swimming underwater using scuba and finish when the distance is 200 meters. Finish is registered when athlete touches the pool border with his/her hand.