Two technicians working on a fire-suppression system at an Antarctica scientific station were found unconscious and died, the US National Science Foundation says.
The foundation says the two had been working in a building at McMurdo Station, which is on Ross Island.
They were found on the floor by a helicopter pilot who had landed after spotting what appeared to be smoke from the building.
Both were taken from the building and given CPR; one died at the scene.
The other was flown to a clinic and pronounced dead shortly after, the foundation said on Wednesday.
The pair was employed by a Virginia-based subcontractor and the deaths are under investigation.
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