A veteran fishing boat captain jumped into cold, rough waters to save one of his crew members after their vessel capsized off the Alaska coast.

US Coast Guard video of one of the rescues shows Captain Christian Trosvig in an orange life vest swimming to a man struggling to stay afloat and pulling him to an awaiting boat.

The Coast Guard says the captain of the Grayling leapt into 47-degree water during Monday's terrifying ordeal.

Captain's in charge: Alaska fishing boat Captain Christian Trosvig is seen in an orange life jacket on Monday, trying to pull one of his crew members to safety after a capsizing

In this still image from video taken on Monday by the Coast Guard, the captain, left, rescues the unconscious crewman in the Kupreanof Strait near Raspberry Island, Alaska

Trosvig had to swim 50 yard in 47-degree water to reach the unfortunate fisherman

Saving a life: The 47-year-old skipper then preformed CPR on the man for five minutes to revive him

Coast Guard Petty Officer Bill Colclough says the fishing boat skipper administered CPR to one of the crew, who was evacuated for medical treatment. A fourth crew member was rescued by another boat.

It's not yet known why the boat capsized. There were 17 mph winds and 5-foot seas at the time of the incident, which occurred in the Kupreanof Strait near Alaska's remote Raspberry Island late Monday afternoon.

Trosvig, 47, who is married and has been fishing for salmon and cod in the Alaska waters since 1998, addressed the dramatic rescue in a Facebook post on Tuesday.

'After losing my twin brother to the sea. It was not going to happen again. To God be the glory for giving the courage and strength to get my man out of the water and bring him back to life,' his status update read.

Fish tales: Trosvig, 47, has been fishing for salmon and cod in the Alaska waters since 1998

Never again: Trosvig (left and right) lost his twin other, Matt, to the sea in a fishing accident in 2005. He wrote on Facebook 'it was not going to happen again'

Coast Guard got a call at 3.25pm on Monday from the crew of another vessel, Captain Dale Pruitt's Calista Marie, reporting that they responded to the capsized Grayling and helped save one crewman from the water.

The Grayling's skiff driver rescued the skipper and pulled him onto the capsized vessel’s skiff, but when Trosvig realized that one of his men was still missing, he jumped back into the water to look for him, reported Alaska Native News.

Trosvig said the crew member found himself trapped in an air pocket inside the overturned vessel. He managed to climb out a window but passed out and was not breathing by the time the captain spotted his head bobbing in the water.

The man was not wearing a life jacket at the time.

Trosvig, who was wearing a orange life jacket, swam about 50 yards to reach his unconscious crew member, whom he then pulled out of the water and revived by performing CPR on him for about five minutes, according to the captain of the Calista Marie speaking to Alaska Dispatch News.

There were 17 mph winds and 5-foot seas at the time the Grayling capsized

An MH-60 Jayhawk helicopter that was diverted from a training flight and responded to the scene of the accident recorded the moment Captain Trosvig saved his crew member.

The Coast Guard aircraft then picked up both men and transported them to Kodak Municipal Airport, where an ambulance was awaiting to take the rescued crewman to Providence Kodiak Island Medical Center to be treated for hypothermia and exposure to diesel fuel.

'That fisherman didn't hesitate. It was incredible to see him jump into 47-degree water to save his crew,' said Lt. Kevin Riley, an Air Station Kodiak Jayhawk pilot, in a statement. 'It is a testament to how tough those fishermen are and how far they will go to help their fellow Alaskans.'

Trosvig's twin brother, Matthew Trosvig, fell overboard and was lost from the Grayling near Akutan, Alaska, in August 2005. He was 35 years old.