Sheriff's officers are looking for Nate Phillips, 17, of Aptos, who was last seen Monday night after he took off on his bicycle.
He told the family he was "going off on an adventure" with limited supplies on his bicycle. He hasn't been heard from since.
He's 5 feet 7 inches tall and weighs 145 pounds.
If you have information please contact the sheriff's office at (831) 471-1121.