The United States Coast Guard (USCG) on Tuesday said only one boater, a 15-year-old, was rescued alive after three individuals went missing earlier this week.

Rescue personnel found the teenager “clinging to the capsized vessel” Monday off the coast of Alaska. Officials said crews found him in the midst of a medical emergency.

The “survivor was rescued from the overturned skiff experiencing symptoms of hypothermia,” officials said.

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The two other mariners were found dead after the 18-foot fishing vessel they were aboard overturned about 4 miles east of St. Lawrence Island, according to authorities.

The Coast Guard said crews initiated a search mission early Monday after Alaska State Troopers notified the Coast Guard of an overdue boat Sunday evening. The vessel was expected to return Sunday at 3 a.m.

Officials said crews were unable to launch a rescue mission until Monday morning due to weather and poor visibility.

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After launching an aircrew, personnel spotted the survivor and deployed a raft with survival equipment.

Officials said a good Samaritan vessel also stepped in, rescuing the 15-year-old survivor and recovering the bodies of the two deceased mariners from the water.

The two mariners and the teen survivor were then brought to Nome, Alaska, officials said.