Twelve people, including two guides, set out to climb Klyuchevskaya Sopka a week ago.
After struggling, three climbers had been rescued.
The original group of 12 visitors and a tour guide were helicoptered out.
The group of remaining members had passed away.
According to authorities, one of the three climbers has frostbite on their arms and legs, while the other two are in better health.
The director of a tour company is currently the subject of a criminal probe by investigators.