The group, consisting of two people: Sergey Cherkes and Mikhail Nikolayev under instructors Igor Rozhok and Alexey Baystruchenko successfully mastered the program PADI Tec Rec, consisting of three courses Tec40, Tec45 and Tec50. The program is a start-up phase of development of technical diving and opens up the possibility of deep dives with decompression strategy.