4 killed in helicopter crash in remote Alaskan lake during fieldwork

A helicopter carrying a pilot and three Alaska state workers crashed in a remote lake in the state's North Slope region.
The victims were conducting fieldwork for the Alaska Department of Natural Resources when the crash occurred.
No survivors were found after search and rescue efforts located the wreckage in a large, shallow lake around 50 miles southwest of Utqiagvik.
The National Transportation Safety Board is investigating the cause of the fatal crash.
A dive team was deployed to recover the bodies from the submerged wreckage in the lake.