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KEY LARGO (CBSMiami/AP) — A man visiting from California has drowned while diving off the coast of Key Largo.

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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.

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.

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

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)