OAKLAND (CBS SF) — Rescue divers pulled an unconscious driver from a cab that careened off a road near the Oakland International Airport Sunday and became submerged in the Oakland Estuary, authorities said.

The incident began at around 8 a.m. when for some reason a Raj Cab company vehicle left the roadway at Doolittle Road at Langley and immediately became submerged in four feet of water in the estuary.

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Originally, it was reported that two people were in the cab, but authorities believe the driver was the only person in the vehicle.

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Dive teams from both the Oakland and Alameda fire departments were dispatched to the scene. The cab was located under water, a window was broken and the driver was pulled from the vehicle.

Authorities said the driver was unconscious and rushed to Highland Hospital for treatment. He later died of his injuries.

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A cause of the accident was still under investigation.