Officials in Canada said Wednesday the search for several missing people will likely turn up no survivors after a plane carrying four Americans and three Canadians crashed earlier this week.

Three passengers have already been confirmed dead after a de Havilland DHC-2 Beaver operated by Air Saguenay crashed in Mistastin Lake in the Eastern Canadian province of Newfoundland and Labrador Monday.

The aircraft departed from Three Rivers Lodge on Crossroads Lake in Quebec that morning and headed to a remote fishing camp on Mistastin Lake. The plane was expected to return that evening but never made the trip.

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Sometime after 5 a.m. Tuesday, another aircraft spotted the wreckage submerged in water below, about a mile off the shoreline.

Two helicopters and a floatplane were dispatched to the crash scene to search for any survivors.

Three people were confirmed dead, including the pilot, but officials said Wednesday that rescue efforts have evolved into recovery efforts.

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“The hope for our finding the missing persons alive is very low,” Jean Tremblay, president of Air Saguenay, told Reuters.

Maj. Mark Gough of Maritime Forces Atlantic, which is coordinating the rescue effort, said that if anyone were to have survived the crash “they would have had a bit of a swim to get to land.”

Gough said it was not immediately clear what caused the Beaver to crash or at what time it approximately took place. He did add that weather conditions were “fair” the day the plane took off.

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According to the Canadian Broadcasting Corporation, the plane was carrying four Americans and three Canadians, all men. The nationalities of the three known victims were not immediately clear

The Canadian Transport Safety Board said it would deploy a team of investigators to gather information about the crash.

The Associated Press contributed to this report.