If you're a billionaire running out of things to buy, consider a luxury submarine. There are 100 of them, including one owned by Paul Allen.

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The luxury-submarine business is sometimes hard to fathom.

“If you can find my submarine, it’s yours,” says Russian oil billionaire Roman Abramovich. That’s all the reclusive owner of the Chelsea Football Club has to say.

The ocean floor is the final spending frontier for the world’s richest people. Journeying to see what’s on the bottom aboard a personal submersible is a wretched excess guaranteed to trump the average mogul’s stable of vintage Bugattis or a $38 million round-trip ticket to the international space station aboard a Russian rocket.

Luxury-sub makers and salesmen from the Pacific Ocean to the Persian Gulf say fantasy and secrecy are the foundations of this nautical niche industry built on madcap multibillionaires.

“Everyone down there is a wealthy eccentric,” says Jean-Claude Carme, vice president of marketing for U.S. Submarines, a Portland company that custom builds submarines. “They’re all intensely secretive.”

Who owns the estimated 100 luxury subs carousing the Seven Seas mostly remains a mystery.

Microsoft co-founder Paul Allen warned his boat builder that loose lips sink ships.

“Not really supposed to talk about the sub, but it’s a fancy one, a mighty nice piece of work,” says Fred Rodie, one of the engineers who designed Allen’s undersea yacht at Olympic Tool & Engineering in Shelton, Mason County.

“If I told you, I’d have to shoot you,” says Bruce Jones, president and founder of U.S. Submarines, about the names in his client book.

Jones, the 50-year-old son of a marine-construction engineer, built his first diesel- and battery-powered sub in 1993. Every sales contract since then has included a confidentiality clause to protect the buyer’s identity.

“This is a nasty cutthroat business,” Jones says.

Herve Jaubert, a former French navy commando, swapped his cutlass for a screwdriver in 1995 to build his first luxury submarine. Now chief executive of Exomos, a Dubai-based custom-sub maker, Jaubert takes a more romantic view of the work: “I’m a poet who builds submersible yachts for rich people.”

“Spending $80 million for a boat that goes underwater in a market where one that doesn’t costs $150 million is a deal,” Jones says. “Our Phoenix 1000 is four stories tall, a 65-meter-long blend of a tourist and military sub.”

The ultimate war submarine, the U.S. Navy’s Virginia-class New Attack Submarine, costs $2.4 billion and carries 16 Tomahawk cruise missiles. Jones says the most dangerous projectile on the Phoenix 1000 is a Champagne cork.

“Navies want weapon-delivery systems,” Jones says, walking in a forest near Idaho’s Lake Pend Oreille, original site of the U.S. Navy’s Farragut Naval Training Station. “I build luxury-delivery systems for people who have more money than they know what to do with.”

It isn’t cheap to run silent and sleep deep. Jaubert’s 10-passenger sub costs $15 million. A gymnasium is optional.

U.S. Submarines’ midsize model is the $25 million Seattle 1000, a three-story-tall vessel with five staterooms, five bathrooms, two kitchens, a gym, a wine cellar and a 30-foot-long by 15-foot-wide observation portal. It has a range of 3,000 nautical miles.

“The one thing I won’t make for anyone is a yellow submarine,” Jones says.

Allen’s 40-foot-long sub came with a $12 million sticker price and enough extras to stay submerged for a week. Its color: yellow.

Jaubert says one of the dangers shared by members of this underwater fraternity is being blown to smithereens by depth charges.

“Side sonar scanners are always mistaken for torpedo tubes,” Jaubert says, slapping the blue hull of a three-seat, $350,000 “sport luxury model” under construction in his factory.

“Government agencies make visits to see if there are torpedoes aboard our boats,” Jaubert says. “Owners are supposed to let authorities know when they’re in the area. They often don’t, and it causes problems.”

As for the chance of Allen’s sub being reduced to flotsam, “we don’t comment on personal matters that involve the Allen family,” says his spokesman, Michael Nank.

As for marine life, the local dolphin population can be a problem for some submariners.

Jaubert says he has clients who wrestle with how to conduct a deep-sea love affair in front of an observation window without creating underwater paparazzi.

“Dolphins are easily excited when they sense people making love,” Jones says. “They get jealous and bang their noses against the window.”

The best solution? Curtains, says Jones.