A 15-year-old boy survived days at sea after a fishing boat capsized off Alaska, killing his older brother and cousin.

The teen was rescued Monday after he was found clinging to the overturned vessel about four miles east of St. Lawrence Island, the United States Coast Guard said in a news release.

Two other people were found unresponsive in the water. NBC affiliate KTUU of Anchorage identified them as the teen’s older brother and cousin.

The brother died after getting stuck under the boat, the 15-year-old’s mother told the news station. The cousin survived for a day but died, the woman said.

The group was on an 18-foot fishing vessel near the island when it capsized. The Coast Guard said it was notified Sunday night of the overdue vessel. The boat had last been seen Friday departing Savoonga.

Due to the weather and poor visibility Sunday night, an aircrew launched Monday morning to begin the search. The teen was located around 3 p.m. Monday.

“Watchstanders at the Coast Guard Arctic District command center coordinated the rescue of the survivor with the Northwest Explorer, a nearby good Samaritan vessel,” the Coast Guard said. “Before departing the scene to refuel, the HC-130 aircrew deployed a line of flares to guide the Northwest Explorer to the overturned vessel.”

Video obtained by KTUU showed the moment the teen was rescued.

The boy, appearing to wear a black hoodie underneath a coat with green pants and black boots, is seen kneeling on the vessel.

Rear Adm. Bob Little, the commander of the Coast Guard Arctic District command center, said their hearts go out to the families and friends, and communities affected by the tragedy.

“We are grateful for the incredible efforts of the motor vessel Northwest Explorer, Federal, State, Village first responders and mission partners who assisted in the effort that resulted in a life saved,” Little said.