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10 of the most dangerous stunts of all time

Skydiver Luke Aikins signals to pilot Aaron Fitzgerald as he prepares to jump from a helicopter in Simi Valley, Calif., July 25, 2016. AP Photo/Jae C. Hong

Although he's one of the most accomplished skydivers in the world, Luke Aikins will tell you that his latest jump - out of a plane at 25,000 feet without a parachute - was one crazy stunt.

"If I wasn't nervous I would be stupid," Aikins, who has jumped 18,000 times with a parachute, said recently as he prepared to jump from 25,000 feet without one. He landed safely in a giant net during a live television broadcast.

Crazy perhaps, but only the latest in a long line of outrageous endeavors. Here are 10 of the craziest and most dangerous.

Evel Knievel's Snake River Canyon Jump

Evel Knievel is shown in his rocket-powered "Skycycle" on Sept. 8, 1974, before his failed attempt at a highly promoted 3/4-mile leap across Snake River Canyon in Idaho. The parachute malfunctioned and deployed after takeoff. Strong winds blew the cycle into the canyon, landing him close to the swirling river below. AP Photo/File

After years of jumping motorcycles over buses, trucks and fountains, and breaking many of his bones, Knievel decided to ride a rocket-powered motorcycle across a mile-wide chasm in Utah's Snake River Canyon on Sept. 8, 1974. He didn't make it, his cycle crashing on the canyon floor below. His escape chute deployed prematurely, likely saving his life.

Felix Baumgartner's Stratosphere Jump

In this Oct. 14, 2012, photo provided by Red Bull Stratos, pilot Felix Baumgartner of Austria jumps out of the capsule during the final manned flight for Red Bull Stratos. AP Photo, file

The Austrian daredevil became the first skydiver to break the speed of sound when he jumped from a small capsule 24 miles above Earth on Oct. 14, 2012, and landed safely on the ground near Roswell, New Mexico, nine minutes later. Aikins helped train Baumgartner for that stunt and was the backup jumper.

The Trade Towers Walk

In this Aug. 7, 1974 file photo, Philippe Petit, a French high wire artist, walks across a tightrope suspended between the World Trade Center's Twin Towers in New York. AP Photo/Alan Welner, file

Philippe Petit and his companions surreptitiously strung a wire between New York City's then-recently constructed World Trade Towers on Aug. 6, 1974, and Petit walked across it the next day. He danced, strutted and clowned around for 45 minutes as startled bystanders watched from 110 stories below. The Frenchman's stunt is the subject of the 2008 documentary "Man on Wire" and the 2015 film "The Walk."

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Karl Wallenda's Final Walk

Helen Wallenda, center, arrived home in Sarasota, Fla., on March 23, 1978, with the body of her husband, Karl, and was met by about 25 relatives and circus friends. Helping her off the plane are Marjorie Geiger, left, and Herman Wallenda, Karl's older brother. Aerial performer Karl Wallenda fell to his death at age 73 in a tightrope walk at a hotel in Puerto Rico. AP File photo

The patriarch of the famous German high-wire-walking family plunged to his death on March 22, 1978, while attempting to cross a wire strung between two hotel towers in San Juan, Puerto Rico. Although the 73-year-old Wallenda had performed much more difficult stunts, a wind gust caught him off guard and he fell. In 2012, his great-grandson, Nik Wallenda, became the first person to walk a tightrope across Niagara Falls. And a year later he tight-roped across a gorge near the Grand Canyon.

Daredevil Nik Wallenda walks across gorge near Grand Canyon

Move Over Knievel

In this handout image provided by Red Bull Photofiles, Robbie Maddison jumps his bike more than 100 feet high and to land on the top of the 96-foot-high and 40-foot-deep replica of the Arc de Triomphe in front of Paris Las Vegas on December 31, 2008 in Las Vegas, Nevada. Photo by Christian Pondella/Red Bull Photofiles via Getty Images

Record-setting Australian motorcycle daredevil Robbie Maddison rang in 2009 by flying his bike 120 feet through the air and landing on Paris Las Vegas hotel's 96-foot-high arch. The feat put a gash in one hand that required 10 stitches. Noting afterward that he'd previously broken his neck, wrist and collarbone doing stunts, Maddison said he considered this injury no more than a paper cut.

Mad Mike Hughes' Steam-Powered Rocket Jump

Using a rocket powered by the same technology as Knievel's Snake River motorcycle, Hughes soared 1,374 feet across the Arizona desert in January 2014, staggering out of the contraption after it landed. He plans a longer jump later this year.

Dean Potter's Last BASE Jump

Dean Potter receives his award for World Alternative Sportsman of the Year on May 20, 2003 during the Laureus World Sports Awards held at the Grimaldi Forum in Monaco. David Cannon/Laureus via Getty Images

One of the sport's most acclaimed and safety-conscious jumpers, Potter, 43, was attempting a twilight wingsuit leap from Yosemite National Park's Taft Point on May 16, 2015, when something went wrong and he plunged to his death. Graham Hunt, a friend jumping with him, also died. BASE jumping is an acronym for leaping from a building, antenna, span or Earth and is banned in Yosemite, although it occurs there with some regularity.

A dangerous stunt led to the death of two daredevils

Johnny Strange's Final Flight

Johnny Strange arrives at Global Green USA's 8th annual pre-Oscar party "Greener Cities For A Cooler Planet" held at Avalon Feb. 23, 2011, in Hollywood, California. Jason Merritt/Getty Images for Global Green

The American adventurer, who at 17 became the youngest person to summit the highest mountains on all seven continents, was 23 last October when he crashed into a mountain in the Swiss Alps while filming a video for a new wingsuit. The day before he'd posted on social media stunning close-to-the-ground photos he'd taken, but he'd also noted the weather had been unpredictable.

Feats of the French Spiderman

French "Spiderman" Alain Robert climbs the world's tallest building Taipei 101, in Taipei, 25 December 2004. PATRICK LIN/AFP/Getty Images

"Urban climber" Alain Robert has scaled the tallest structures all over the world, often without ropes or harnesses and sometimes illegally. On Christmas Day 2004 he climbed to the top of Taiwan's Taipei 101 Building, which at the time was the world's tallest. Braving rain and wind, he climbed for four hours to get to the top, stopping along the way to chat with Taiwan's president.

Changing Planes in Midair

That's what Paul Steiner did in 2010 when he climbed out of one glider flying at about 100 miles per hour over Austria, jumped onto the wing of another and then stood up and grabbed hold of the tail wing of the first plane as they flew in tandem. Steiner was wearing a parachute at the time, which he used to get back to the ground safely.

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