A Robinson helicopter has reportedly crashed in Lake Teletskoye in the Altai mountains, a source in the local emergencies services told Russian News Agency (TASS). 
"According to preliminary information, the helicopter crashed 40 kilometers southeast of the settlement of Artybash, into a hard-to-reach area in Lake Teletskoye. The accident was reported by an eyewitness," the source said. 
All five people on board the helicopter were killed.

Source: QNA