KEY LARGO, Fla. (AP) — A man visiting from California has drowned while diving off the Florida coast.

The Monroe County Sheriff’s Office says that 56-year-old Dimitry Altschuller was on his second dive during an excursion off Key Largo, Florida on Friday when he apparently ran out of air.

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Altschuller’s dive partner shared his air and they managed to reach the water’s surface.

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But authorities say Atschuller appeared to panic, became unconscious and stopped breathing.

A state wildlife vessel arrived and took Atschuller to shore.

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The sheriff’s office said in a statement that he was taken to a nearby hospital where he was pronounced dead.