The video shows a swimmer in a black swimsuit standing on a diving board, preparing to dive into a pool. He then dives into the water and swims the backstroke. The swimmer is competing against other swimmers in the pool, and the crowd is cheering him on. The swimmer is wearing a blue swim cap and goggles. The pool is indoors, and there are several lanes with swimmers in each lane. The video captures the swimmer's movements as he swims, and the crowd's reaction to his performance.