Oleg Blinov, an instructor of the Cosmonaut Training Center, wearing a protective face mask is seen ahead of the SIRIUS-2021 international isolation experiment simulating a mission to the Moon, in Moscow, Russia. The six volunteers will spend 240 days in a simulator of a spacecraft - a ground-based test complex in Moscow. The task of the "crew" is to simulate the flight, landing on the Moon and work on its surface.