Men and ladies take part in separate categories. Total distance is 100 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 earlier than the mark of 15 m and not later than 15 m before opposite sidewall, an athlete should remove his scuba, establish negative buoyancy for scuba and leave it at the bottom.
If athlete removes scuba closer than 15 m mark from sidewalls, penalty time is 10 seconds. Athletes swim up to the surface and start free style swimming using mask, snorkel and fins. An athlete should make a reverse near the sidewall and continue free style swimming using mask, fins and snorkel. When he/she reaches the scuba he/she should dive with the breath hold, take scuba, start breathing from the regulator and continue swimming underwater, same time replacing and adjusting scuba. Scuba must be completely replaced and adjusted before finish. An athlete finishes the distance after 100 meters. Finish is registered when athlete touches the pool border with his/her hand.