Intense search reveals no sign of Mil Mi-8 lost early Saturday with 12 people on board.
The Mi-8 training flight ‘exploded’ after slamming into a field with communications antennae at Khabarovsk Disaster Medicine Centre.
Private helicopter brought in to located Tyva Avia aircraft that had 13 people on board in remote Siberia.
Helicopter suffers extensive damage and blades snap off - but only one injury.
Aircraft had been flying as part of a test flight following an engine change when it came down.
Group of tourists got stuck at 2,300m after helicopter blades froze.
Rescuers vow to find helicopter that vanished in strong winds on 10 October.
Survivor from helicopter disaster 'used stars and moon' to direct rescuers to crash site: he was only of 3 survivors out of 22 on board.
Wife pleaded with rescuers to search for the businessman saying: 'We feel that our man is dying.’