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It鈥檚 dark and it鈥檚 cold, just a few degrees above freezing. And it feels as if a garden hose has been turned on you. You鈥檙e alert to your body鈥檚 messages, mindful of the deadly consequences if hypothermia sets in.

Oh, and you鈥檙e caked in mud and, depending on the expedition, you may not have showered in three weeks. You鈥檙e ravenous and exhausted, having expended your food supply and your energy during your 30-mile hike just to reach the vertical cave, where you鈥檙e descending hundreds of feet into the earth, sometimes navigating narrow passages, sometimes searching for holds, sometimes rappelling, sometimes toeing your way through rubble. Sometimes people die.

The bottoms of the caves 鈥渁re terrible places. They鈥檙e horrible,鈥� said Philip Rykwalder 鈥�01. 鈥淭hey鈥檙e great memories for me.鈥�

This is nirvana for Rykwalder, whose passion for caving was ignited at age 14 when he and a friend summoned the nerve to crawl into a 55-foot horizontal cave in his suburban Nashville, Tennessee, neighborhood, carrying a BB gun, a candle and a flashlight. That led to nearly 30 years of cave exploration, first in the 80 Nashville-area caves, and then on to caves in at least 18 American states and at least 10 other countries: Canada, China, Ecuador, Greece, Guam, Guatemala (eight times), Mexico (at least 40 times), the Philippines, Russia and Ukraine.

鈥淐aving is all about discovery. That鈥檚 the goal: Discovery, like going to the moon, something new,鈥� said Rykwalder. 鈥溾�� Caving for me is not a thrill thing like skydiving or whatever. It鈥檚 the thrill of the unknown. What鈥檚 around the next corner?鈥�

For a while, caving defined Rykwalder鈥檚 lifestyle. After graduating from DePauw with a degree in geology and earning a master鈥檚 in the same subject at the University of Texas at San Antonio, 鈥淚 got a job for a hot minute,鈥� he said. 鈥淎nd I was like, I just want to go caving. And so honestly, I moved into a van and I drove around the country going caving for years.鈥�

He would do $15-an-hour manual labor for half the year, usually sleeping in his van or on a friend鈥檚 floor, so he could afford to cave for the other half, often in faraway lands. He escorted photo and video crews for National Geographic, The Discovery Channel, the Weather Channel and the U.S. Army into caves, and worked on the film 鈥淣o Place on Earth,鈥� a documentary about 39 Jews who survived World War II by living in a Ukraine cave for 544 days.

His goal was to be internationally known as the best American caver. 鈥淢y strategy was to find the deepest cave in the U.S. and I could hang my hat on that,鈥� he said. 鈥淎t the same time, I knew it is probably impossible. There are, ballpark, 100,000 caves in the U.S., and what are your chances of finding the single deepest one?鈥�

Turns out his chances were pretty good. Among the many caves that Rykwalder and his caving partner have found is the deepest known limestone cave in America, the 1,863-foot Tears of the Turtle, which they discovered in 2006.

鈥淭ears is terrible,鈥� he said. 鈥淚t鈥檚 well named. It鈥檚 terrible. The whole thing is just a crack, an 18-hundred-foot-deep crack.鈥�

They also discovered the third-deepest cave in America, Virgil the Turtle鈥檚 Great House, at 1,586 feet, and the 13th deepest, Tickle Me Turtle, at 1,027 feet. All are in Flathead County, Montana.

(Three lava tubes in Hawaii are considerably deeper, but Rykwalder said that 鈥渢here are snobs among us; we want limestone. That鈥檚 the classic.鈥�)

鈥淟iterally our life plan was to spend our whole lives looking for the deepest cave in the U.S.,鈥� Rykwalder said. 鈥淲e found it when I was 27.鈥�

That was a problem. 鈥淚 was content turning old and not having accomplished that goal,鈥� he said. 鈥淚 figured it would take me into my old age in caving, just the search. So at 27 I found that, and 鈥� my drive dissolved, because I accomplished my life goal a little early. 鈥�

鈥淣othing worked anymore. I didn鈥檛 like living in my van. I didn鈥檛 like living on, sleeping on floors. I didn鈥檛 like not having any money. I didn鈥檛 like not going out to eat. I had no luxuries. And, you get older and I (thought) I would like a person.鈥�

Oh, he still loves caving. In fact, he鈥檚 thinking of going to Crete in the fall and last March he spent several weeks in Mexico, exploring the Chev茅 Cave, which, at 5,039 feet, is the world鈥檚 11th deepest. (An Indiana caver died there in 1991.) Last year, Rykwalder helped establish the second of five camps in Chev茅 on a flat spot that emanates from the vertical shaft. He lived 10 days at the camp.

鈥淚 realized I needed a new goal, so I set the goal on business,鈥� he said. He moved in with his parents and started companies that did mobile car detailing; caving tours; roofing; and insurance adjusting. All failed. He landed on real estate wholesaling, in which he bought a house and then sold it on contract for a profit. He began flipping houses. And he bought one rental house, then more.

The Nashville market was pricey, so he moved to Chattanooga, where he has expanded his rental portfolio. When he had problems with contractors, he started a construction company. When he suspected a property management company of fraud, he started his own management company, which now manages almost 1,000 properties 鈥� his and others鈥�. He joined the Hamilton County Cave and Cliff Rescue group, with which he has been involved in about eight rescues in two years. And he found his person; she caves too.

When the businesses get to be too much, Rykwalder goes caving; his business partners understand that. 鈥淢y happiness is way more important than a little bit more money,鈥� he said.

鈥淚f I had to give up 95% of my life, there鈥檇 be no hesitation: I鈥檇 keep caving,鈥� he said. 鈥淚 would give up my real estate, my businesses or whatever, and I would retain caving. I could build the businesses back up. The cavers and the caving are my people.鈥�

Top photo: Rykwalder in Rio Secreto in Quintana Roo by Dave Bunnell.