A rescue and recovery dive team was deployed Saturday (July 22) after a helicopter with a pilot and three state workers crashed in a large lake on Alaska含羞草研究社檚 North Slope, officials said.

No survivors have been located.

含羞草研究社淭he official word is, they are missing, presumed fatal,含羞草研究社� said Clint Johnson, the chief of the National Transportation Safety Board含羞草研究社檚 Alaska region.

An NTSB investigators was also en route to the accident scene Saturday as plans were being made to recover the wreckage from the water, he said.

The helicopter had been chartered by the Alaska Department of Natural Resources, the department said in a statement Friday. It was carrying three employees from the Division of Geological and Geophysical Survey who had been conducting field work.

含羞草研究社淒NR is praying for our employees and the pilot, their families, and the DNR team,含羞草研究社� the statement said. 含羞草研究社淲e are continuing to await updates from the search and rescue effort.含羞草研究社�

Natural Resources Commissioner John Boyle flew to the crash site Friday night with a North Slope Search and Rescue spotter ahead of the recovery operation, said Lorraine Henry, a spokesperson for the state agency.

The Bell 206 helicopter was reported overdue Thursday night. A North Slope Borough search and rescue team in a helicopter found debris matching the description of the missing helicopter, D.J. Fauske, the borough含羞草研究社檚 director of government and external affairs, said in a text to The Associated Press on Friday.

Fauske didn含羞草研究社檛 immediately respond to messages Saturday.

The helicopter含羞草研究社檚 wreckage was found in a lake near Wainwright, which is about 50 miles (80 kilometers) south of Utqiagvik, the northernmost city in the U.S., formerly known as Barrow.

含羞草研究社淭he helicopter is in shallow water, it is in the middle of a very large lake,含羞草研究社� Johnson said. 含羞草研究社淪o there is a challenge as far as getting the wreckage out of there.含羞草研究社�

The North Slope Borough requested that the Alaska State Troopers activate the Alaska Dive Search, Rescue and Recovery Team, troopers spokesperson Austin McDaniel said in an email to The Associated Press.

The team was en route Saturday to Utqiagvik, located on the coast of the Arctic Ocean about 720 miles (1,159 kilometers) northwest of Anchorage. The borough is the primary agency coordinating efforts at the crash site, McDaniel said.

The helicopter flight originated in Utqiagvik and was supposed to return there, Johnson said, adding other details of the flight were not immediately available.

The helicopter was operated by Maritime Helicopters Inc., according to a statement on the company含羞草研究社檚 website. It confirmed the accident was fatal and said names of the pilot and passengers would be released pending notification of next of kin.

Mark Thiessen, The Associated Press

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