Though Thompson has a much smaller build (5-10, 165 pounds) than Wagner, there are similarities.

"We're both bald," he quipped, now shaving his head as Wagner has done for years.

That may not be enough for them to locate each other after the chaotic start with nearly 2,000 entrants splashing into the water from the decks of the San Francisco Belle. But the goal is simply to have both finish rather than necessarily hook up at the different stages.

David Wagner (left) with his half-brother,
Todd Thompson (right), and
Todd's son, Chase (middle)

"David has done more grueling races and has more experience," Thompson said. "This is a reasonably big race for me. It's a bit of a challenge and when you read about it – the run bringing pros to their knees and the swim start – it's going to be interesting."

Adding to Wagner's worries are foot injuries that have slowed his training. Still, he's excited about yet another challenge in his life.

"The Escape from Alcatraz is one of those bucket-list races. If you can get in and do it, it's one of the best races out there," Wagner said.

That's where the final twist comes into play.

Wagner entered in December through a lottery system and secured a spot, then urged Thompson the next day to sign up for the February lottery.

When Thompson did, a computer glitch automatically secured his entry.

"He took it as maybe it was just meant to be," Wagner said.

Taking the plunge together only adds to the thrill.

Lynn DeBruin, a former Rocky Mountain News sportswriter, is a freelance writer/photographer based in Denver.

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