PESCADERO (CBS SF) — Search crews found a man floating unconscious and not breathing in the waters just off Pigeon Point Lighthouse in Pescadero, according to the San Mateo County Sheriff’s Office.

It happened at about 4:47 a.m. on Monday.

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Deputies and a Coast Guard helicopter scoured an area along Highway 1 after getting a report that a man was calling for help.

They located a man about 30 yards from the shore, just south of the lighthouse.

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Deputies brought the man ashore and performed CPR but they were unable to revive him.

The San Mateo County Coroner’s Office has not identified the man yet.

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The San Mateo County Sheriff’s Office was asking anyone who has information to plese call Detective Jerri Cosens at 650-363-4347 or the San Mateo County Sheriff’s Anonymous Tip Line at 1-800-547-2700.