A group of friends from Jefferson County believe they know how to survive the apocalypse.

They're going to share their secrets at 9 p.m. tonight on the National Geographic Channel television series "Doomsday Preppers." On local Comcast, the National Geographic Channel is 109; the HD version of the channel is 413.

Among those featured in the segment is Scott Spence, who lives in Greeneville.

The men believe "there is a doomsday coming to the world. It's called the final judgment," said Lucas Cameron, 27, who produced a YouTube video called the "7 Trumpets Prepper."

Cameron said the "Seven Trumpets of Revelation" are contained in the Bible and describe seven signs from God heralding the end of days.

The "7 Trumpets Prepper" offers tips on how to survive.

A National Geographic crew visited Cameron's beef cattle farm in White Pine in spring 2012 and documented some of the preparations the group is making.

"They saw our YouTube channel and decided to give it a spin," Cameron said.

Cameron is affiliated with a non-denominational, not-for-profit organization called Loud Cry Ministries.

He said the Bible foretells a great earthquake, then "about two or three years when everything calms down" before the end begins in earnest.

The Mayan calendar, which some believed predicted the end of the world on Dec. 21, 2012, was a recent hot topic.

Nothing happened.

"We've seen all these false prophecies," Cameron said. "I hope [the television segment] is a wake-up to the world."

Cameron is leader of a core group of lifelong friends who grew up in the White Pine area who are featured in the "Doomsday Preppers" series tonight. Spence is one of the believers.

"I'm so excited. I've been bouncing off the walls for two weeks," he said Monday.

"Our prepper channel on YouTube is doing a lot, but this will help by leaps and bounds."

When the time is right, members of the prepper group will "relocate" to Cameron's farm, Spence said. They will have plenty of food, fuel and weapons to protect themselves.

"It's amazing, a couple local fellas from East Tennessee making it onto National Geographic just by making a YouTube channel," Spence said.

The group numbers several Marine Corps veterans. While the Seven Trumpets group is well armed, weapons are not the key to survival, Cameron said.

Self-sufficiency is just as important, he said.

"I'm not in a militia, and I actually hate guns, but we live in a world where we have to have them, unfortunately," Cameron said.

One survival device the group uses on the YouTube channel 7trumpetsprepper, is a homemade "gasifier."

From burning wood, the device generates fuel that can run generators and vehicles. A how-to guide to making a gasifier is one of the things featured on the channel.

"It's a good educational tool," said Cameron, who began making ready for the earth's final days more than two years ago.

He said he hopes the exposure on the "Doomsday Preppers" show will help open more eyes to the Seven Trumpets of Revelation scenario.

"People should read the first seven chapters of [the Book of] Revelation and see how it turns out," he said. "It's starting to happen."

The television segment tonight should help spread the word, Cameron said.

"I think a lot more people will take more interest in Bible prophecy. Politicians and leaders are just leading people astray," Cameron said.

Cameron's wife, Nikki, and their 8-year-old son, Jonathan, are participants in the group.

"I try daily to teach him about the Scripture and just have quality time with him," Cameron said.

Meanwhile, there's much work to do.

"I'm going to make the best effort I can," Cameron said. "[God] told Noah to build an ark. He didn't wait for rain. He went to work."