An Iranian peace activist had to be rescued by the US Coast Guard after attempting to float from Florida to Bermuda in a self-built inflatable bubble.
Reza Baluchi was reportedly picked up about 70 nautical miles east of St Augustine on Saturday morning after suffering from fatigue and disorientation.
According to Sky News, he was warned of the dangers before making the trip but refused to give up.
He was taken to a nearby coast guard station after being rescued and was described as safe and well.
The Independent reports that Baluchi alerted emergency services for help and was found disorientated and asked rescuers how to get to Bermuda.
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On his website, Baluchi said he planned the trip to raise money "for children in need" and "to inspire those that have lost hope for a better future".
He made the inflatable Hydro-pod from 3mm-thick plastic which he propelled forward by running inside it like a hamster on a wheel. Inflated footballs were placed inside the metal frame.
Reza planned to run in the bubble in the mornings, cool off in the sea while leashed to the Hydro-pod and sleep in a hammock inside it at night.
The US Coast Guard found protein bars in his bubble. He had also planned to catch and eat fish.
World's most extreme holiday activities
Man tries to zorb to Bermuda, is rescued by coast guard
Bolivia is the highest, most isolated and most rugged nation of South America - so it's a brilliant choice for thrill-seekers. Take a 14-night tour that begins in the bustling capital, La Paz, then embarks on a four-night four-wheel drive tour of the world’s largest salt flat, the Salar de Uyuni, which is 10582 square kilometres (4086square miles) before visiting the world’s highest city, Potosi, sitting at an altitude of 4090 metres above sea level. You'll then head to the beautiful colonial town of Sucre and end the tour with five days in the jungle and rainforest. Visit encounterstravel.com
Never mind Alton Towers, you'll find the fastest roller coaster in the world, the Formula Rossa, at the Ferrari World Abu Dhabi. The world’s largest indoor theme park, it was created around the classic double-curve body shell design of a Ferrari car. As well as the Formula Rossa, which powers to 240 kmh in less than five seconds, the park also features over 20 thrilling rides and attractions. Visit ferrariworldabudhabi.com
Take a sailing trip on Lake Titicaca, the highest in the world, where you can also visit the native Uros people, who live on reed islands floating on the water. As well as boat trips, you can give kayaking, and mountain biking a go, and, while you're in Peru, it would be scandalous to miss out on the most spectacular ancient ruins in the world, Machu Picchu, ancient home of the famous Incas. Visit adventuretemples.com
Got a head for heights? You'll need one for the world's highest bungee jump at Macau Tower, which takes you on a free fall at a speed of up to 200kmph from a height of 233 metres. You'll experience a four to five second freefall before stretching the 50 metre bungee cord nearly four times its unloaded length and rebounding at approximately 30 metres above the ground. Thanks to a guide cable system, you'll safely experience a few rebounds before slowly landing onto a specially designed airbag below. We can feel our nerves jangling already… Visit macautower.com
At the heart of Mongolia's Altai Tavan Bogd (Five Holy Peaks), Mount Khuiten is one of the least accessible mountains on earth. This massif lies on the border with both Russia and China, 2000 kilometres (1250 miles) west of the Mongolian capital of Ulaanbaatar. After sightseeing in Ulaanbaatar and enjoying a day's preparatory trekking in the nearby Bogdkhan National Park, take a journey to the remote Kazakh province of Bayan Olgii. Starting out with the straightforward trek to the summit of Malchin (4037m / 13,245ft), you'll get dramatic views of the Potaniin Glacier and of your subsequent climbing objectives; the steep and challenging Mount Khuiten (4374m / 14,350ft) and the easier, non-technical snow dome of Nairandal (4082m / 13,392ft). Visit keadventure.com
Saas-Fee in Switzerland is set in a spectacular location surrounded by the highest mountains in the Swiss Alps and is one of the world's most beautiful ski resorts. But its claim to fame is that it's home to the world’s highest revolving restaurant on the mountain at Mittelallalin. Set at a spectacular 3,500m, you can experience a different magnificent view with starters, main and dessert as the restaurant revolves 360 degrees. You can choose anything from the classic steaming cheese fondues to the fabulous ‘Roesti’ potato dishes served with local meats, washed down with excellent white, rose and red local wines. Visit inghams.co.uk
Seeking the ultimate thrill but don't want to do it on your own? Try the world's highest tandem skydive in Orlando - and share the terror! Orlando Skydiving or Skydive Space Centre offers the jump, which drops you a stomach-churning 18,000 feet (5,486 metres), and offers views over the Atlantic Ocean and the Kennedy Space Centre. See visitorlando.com
This unusual adventure holiday involves cycling over the Indian Himalayas to the Ladakhi capital of Leh, visiting Buddhist monasteries as you go, as well as whitewater rafting on the River Indus. Then, after a necessary acclimatisation process, take on the challenging ascent to (and speedy descent from) the Khardung La, which is the world's highest road pass, at 5380 metres. Leaving Leh, this giant rollercoaster ride to Manali follows what is unquestionably one of the greatest mountain roads on the planet. The Leh to Manali highway crosses the main Himalaya Range by a series of very high passes, including the Taglang La (5280m), the second highest road pass in the world. Visit keadventure.com
Take a trip on the highest cable car in the world, located in Kashmir. The lift provides the easiest way to reach one of the highest points on Earth without a rope! The Gulmarg Gondola is Asia's highest and longest cable car project. The two-stage ropeway ferries about 600 people per hour to and from Kongdoori Mountain, a shoulder of nearby Afarwat Peak (4,200m (13,780ft)). The ropeway project is a joint venture of the Jammu and Kashmir government and French firm Pomagalski. The first stage transfers from the Gulmarg resort at 2,600m (8,530ft) to Kongdoori Station in the bowl-shaped Kongdori valley. The second stage of the ropeway, which has 36 cabins and 18 towers, takes skiers to a height of 3,747m (12,293ft) on Kongdoori Mountain, a shoulder of nearby Afarwat Peak (4,200m (13,780ft)). Visit wildfrontiers.co.uk
At a height of 918ft, a length of 1.2 miles, and a speed of up to 100mph, the Unreal Zip 200 experience at South Africa's Sun City resort is the fastest, longest and highest zip line in the world. The extreme adventure is said to be more like a "flying" feeling than a "falling" one. Sun City is a tourist mecca, and can be three hours from Johannesburg, near the Pilanesberg Game Reserve. Visit 2by2holidays.co.uk
Man tries to zorb to Bermuda, is rescued by coast guard
The world's only underground trampoline is located in Wales and is a massive network of bouncy nets in underground caverns twice the size of St Paul's Cathedral! Visitors at Bounce Below, near the town of Blaenau Ffestiniog, are taken to the impressive 200x60 foot cavern by an old mining train and kitted out in special overalls and a helmet before being let loose to bounce, climb and slide in the unique setting. The walls feature technicoloured lights which illuminate the subterranean background with vibrant colours.
Grab your goggles and snorkels to enter the subterranean rivers at the Xcaret Park near Cancun, Mexico. The Underground Rivers are part of a natural network of channels which circulate under the Yucatan Peninsula. Live the experience of being driven by freshwater streams and explore the Blue River, Maya River or Manatee River at this natural treasure. The whole family can float gently to observe ancient Mayan cenotes, rock formations and marine fossils. The underground rivers are made up of a labyrinth of caves and tunnels that are illuminated by natural light and extend for 600 metres with a depth of 1.60 metres.
Coober Pedy in southern Australia is famed for its fabulous opals and bizarre underground homes. Miners have dug into the white and orange rock to extract the valuable, sparkling stone for generations and today, the outback town is home to a few thousand people who still dig for opal and live underground. Take a guided tour of unusual Coober Pedy to discover the underground museum, art galleries, churches and shops. And be sure to stay in one of the underground hotels to try underground life for yourself!
At the 18th century crypt of St Martin-in-the-Fields, one of London's best-loved churches and arts venues, you can stop for afternoon tea or lunch underground. The impressive self-service Café in the Crypt boasts beautiful architecture, brick-vaulted ceilings and historic tombstones beneath your feet. On Wednesday nights it is open until 10.30pm for Jazz Nights.
Experience the world's only fully underground zip line course in Kentucky, USA at Louisville Mega Cavern. Thrill seekers can enjoy six underground zip lines, including a dual racing zip and two challenge bridges on a zip lining tour at the attraction. A certified zip guide leads you on a 2.5-hour adventure into a part of 17 miles of underground passageways beneath the city of Louisville, and those who fancy something more relaxing can take a one-hour historic tram tour to learn about the geology, history and mining techniques of the man-made cavern.
California's Forestiere Underground Gardens is the work of Sicilian immigrant Baldasare Forestiere who created the subterranean network of over a hundred niches, courtyards, patios, rooms and passageways. The underground gardens are full of life and light, with skylights and courtyards letting in sunlight and rainwater. Visit the unique gardens in Fresno to witness one-of-a-kind fruit producing trees, shrubs and vines growing underground - some of which are over 90 years old. There is also ancient Roman architecture and underground micro-climates, with temperature variations of 10 to 30 degrees.
Adventure hotspot New Zealand has white water rafting nailed, but for something a little different, try black water rafting through underground caves. Also known as cave tubing, black water rafting takes adrenalin junkies down a river in the Waitomo Caves on an inflated rubber tube. The attraction offers the best of backwater rafting organised by the Black Water Rafting Company, with caving, tubing, climbing and swimming taking in the unique glowworms.
Ok, so this isn't open for you to try but it could be one day... In September 2014, Austrian pilot Ivan Trifonov flew a hot air balloon 206 metres underground in Croatia. He successfully landed the balloon at the bottom of the Mamet Cave in the Velebit nature park and the flight took 25 minutes. The Croatian Tourist Board said: "For flying underground, Trifonov had to use a hot air balloon specially designed for this unusual, and probably unrepeatable venture. His balloon was smaller than usual, and the brave pilot set on two gas tanks linked with steel pipes, instead of a basket."
Take a journey deep below and behind the heart of Niagara and stand in the mist where the mighty Horseshoe Falls tumbles from 13 storeys above with the Journey Behind the Falls attraction. You will experience the awesome spectacle of one-fifth of the world’s fresh water crashing down to the basin below, where during summer daylight hours, over 2,800 cubic meters of water thunders over the brink every second at 65 kilometres per hour. Visitors take a lift down 45 metres through bedrock to tunnels leading to the Cataract Portal and Great Falls Portal, one-third of the way behind the massive sheet of water.
Fancy a night in the world's deepest underground hotel room? Situated just north of Stockholm, Sweden, the Sala Silvermine Mine Suite (£370 per night) allows you to enjoy a luxurious and romantic cave stay. The suite for two is 155m underground and surrounded by winding galleries and huge caverns. Upon arrival you'll receive a guided tour and be served a basket of cheese, biscuits, wine and chocolate, before spending the night in the unique suite.