An air pocket kept a 21-year-old woman alive in a submerged car for hours following a crash that claimed the lives of her boyfriend and his sister.

Brian Archila, 21, his 25-year-old sister Jennifer, and his 21-year-old girlfriend Lilibeth Vasquez were driving in Framingham, Mass., when their car veered off the road and flipped into a pond.

Vasquez managed to find a small pocket of air in the car, and she kept her head above water for about three hours until help arrived.

Her boyfriend died trying to save them, The Boston Globe reported. Vasquez told police that Brian went to open the car door to free them, but never returned.

Vasquez was injured but is expected to make a full recovery.

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