HOUSTON (AP) — For hours after their boat sank, Ken Henderson and Ed Coen treaded water in the Gulf of Mexico, talking about life and death while struggling to survive. For more than 30 hours, it worked.

Then Henderson was forced to make a decision that would save his life, but not his best friend's.

"This is the last-ditch effort, but I'm going to go for help or you're not going to make it," Henderson told Coen, just before cutting the strap that connected them in the deep, cold waters off the Texas coast.

"I understand," Coen responded, giving Henderson a last set of instructions. "Kiss them babies for me."

It was Friday around 4 p.m. when they parted.

On Tuesday, days after the fishing trip ended in tragedy, Henderson recounted the harrowing tale for The Associated Press, alternating between sorrow, guilt and laughter as he recalled the last 30 hours of Coen's life and the pain of living life without the man who had been his best friend for 25 years.

The saga began Thursday right around noon. They had been fishing for a few hours and popped open some Diet Coke's. A line in the water, they joked around.

Suddenly, Coen noticed the 30-foot Scarab was filling with water. Henderson started four bilge pumps. Water sprayed everywhere.

Coen quickly unhooked the boat from one of the many oil rigs in area where they had been fishing. Henderson revved an engine, but it died. Frantic, he got both motors roaring — only to have the saltwater that had leaked in kill them quickly. Bow to the wind, it was clear any wave could flip them.

"Mayday, mayday, mayday Marine 16," Henderson called over his Marine radio. He got no response.

He dialed 9-1-1 on his cellphone. There was no signal.

Suddenly, the bow went up. Henderson flew back. Coen jumped to the right, his sunglasses and cap flying off. Already wearing life jackets, the two ex-Marines grabbed extra life jackets and other floating items, including a half full bottle of Diet Coke.

"The water was so cold it took your breath away," Henderson said.

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Coen, a slim man, immediately began to shiver.

After failing to swim to a gas well nearby, the pair prepared for a long wait. Coen worried his life jacket wouldn't hold him up, so Henderson strapped an extra around his friend's neck. Henderson feared he was getting pulled down and put a life jacket between his legs. With his pocket knife, Henderson created a train with an extra life jacket. He tied red material to the top of a boat pole, creating a flag.

And they talked.

"We talked about stuff that I'll never talk about. We discussed things and discussed life. We discussed families. We just tried to keep ourselves occupied," Henderson said.

As night fell, they took turns laying on each other's chests, conserving body heat. They tied their life jackets together to ensure they wouldn't drift apart in the dark.

They dozed. Coen started hallucinating. Henderson tried to keep Coen's arms and legs moving. He called him a sissy to get him angry. But as morning came, Coen's situation worsened. It took time to wake up. He tried to light a cigarette that wasn't in his mouth. He wanted to go to the store.

"I came to the realization that one of us may not make it or that both of us may not make it," Henderson said. "I just felt helpless sitting there with him."

About 3 p.m., the pair drifted toward a manned rig. Henderson realized his friend wasn't keeping his head above water. He put another life jacket behind Coen's head, but his friend pulled it over his face, trying to protect himself from the afternoon sun.

Henderson told Coen to kick to the rig. He pulled him as he swam, but Coen was sideways. Henderson told him to kick. Coen thought he was.

And so Henderson decided to cut the strap.

He swam for two hours, but lost his sense of direction. He was tired. Frustrated. Depressed. He rolled on his back and floated. It was after 7 p.m. when he woke up.

He saw another rig in the distance, and prayed for strength.

He swam, seeing ice and crystal trees in the water. He reminded himself constantly there were no trees. He focused on the phosphorescent plankton glowing in the water. He made it past a blinking light, a milestone that pushed him on toward the rig.

It was 2 a.m.

On legs so weak he could barely lift them, Henderson slowly pulled himself up the rig's barnacle-covered ladder. On deck, he closed and opened his eyes. Gingerly, he touched the floor.

"I'm here. I'm on a derrick," Henderson said out loud.

He found a galley with food, water and a phone. He called his wife, and told her to call the Coast Guard. He said he was on rig 633A. He poured himself a cup of water. He got out of his wet clothes, wrapped himself in a blanket, threw the clothes in a washing machine and reassured the unbelieving Coast Guard he had the right rig number.

"It was over 50 miles from where we went in the water," Henderson said.

All he could think of, though, was Coen. Convinced his friend would survive, he told the Coast Guard where they had parted.

Two hours later, Henderson was ashore in the Coast Guard dispatch room when haunting words came across the radio. A fisherman had found a body in a life jacket.

"Is that Ed? Is that Ed?" Henderson asked as Coast Guard officers ushered him from the room.

Later, in the hospital, Henderson saw his friend. He apologized and asked for forgiveness. He promised to fulfill his wishes, make him proud and look after his girls.

"I felt like a part of me had died out there," Henderson said.

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Plushnick-Masti can be followed on Twitter at https://twitter.com//RamitMastiAP