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IDYLLIC islands with crystal blue waters and white sand beaches hide a radioactive secret.

Off limits to the rest of the world, Bikini and Enewetak atolls in the Marshal Islands were home to more than 23 nuclear detonations between 1946 and 1958.

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Mutated nurse sharks have been spotted with only one dorsal fin swimming in the waters of Bikini AtollCredit: Getty
an aerial view of a large dome on a small island
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Dubbed 'The Tomb', the dome holds roughly 35 Olympic-sized swimming pools of radioactive soil and nuclear wasteCredit: EPA
an aerial view of a large island in the middle of the ocean
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Bikini Atoll is part of the Marshall Islands, located between Hawaii and Australia
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Bikini Atoll was bombed 23 times with nukesCredit: Getty - Contributor
an advertisement for radioactive paradise shows a picture of bikini atol
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The radioactive paradise between Hawaii and the Philippines is now home to mutated sharks missing their second dorsal fin, and larger than life corals.

It was also the site where the first hydrogen bomb was detonated.

Professor of marine sciences at Stanford University Steve Palumbi who is studying the effects of nuclear radiation on the islands said: "There are individual nurse sharks on the Marshall Islands that only have one dorsal fin.

"Popular belief is that radiation causes mutations, and you know what, it's true.

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"Do we have mutant sharks on Bikini Atoll missing a fin? Possibly.

"I've never seen anything like that before and that means we have a scientific mystery to unravel."

The H bomb, which was 1,100 times larger than the atomic bomb that exploded in Hiroshima, had major consequences on Bikini Atoll.

There are now fear that radiation is leaking into the Pacific Ocean through a large concrete dome dubbed "The Tomb", which can be found on nearby Runit Island.

Built in the late 1970s, the large dome which measures 3.1m cubic ft has started to show its age as cracks start to appear.

One of the only visible evidence of any nuclear testing, "The Tomb" is a 377 ft wide bunker, large enough to fit roughly 35 Olympic-sized swimming pools of radioactive soil and nuclear waste.

A look at the 'world's most isolated house'

It was used by the US to ship waste from Nevada, where it was testing nuclear weapons on Native American land.

It is currently unclear how much nuclear waste is seeping into the water ways from under the dome.

Although the marine world is flourishing, the area is still considered dangerous to humans.

A report to the United Nations stated that there was “near-irreversible environmental contamination”.

The atoll was named a UNESCO world heritage site in 2010 because of its direct tangible evidence of the nuclear tests conducted there amid the paradoxical location.

Prior to the nuclear blasts, Bikini islanders' traditional lifestyle was based on cultivating plants and eating shellfish and fish.

The Marshellese people were relatively isolated and had developed a society bound by extended family association and tradition.

The typical climate is hot and humid, with the temperature ranging between 27 and 29 degrees Celsius year round.

The wet season is from May to December while the trade winds from January through May produce higher wave action.

Bikini Atoll remains deserted, apart from a small group of custodians who tend a ghost village.

Food and water must be imported due to contamination that runs through the water and soil of the island.

According to Palumbi, living on the island is impossible.

He said: "People kept trying to move back here but they couldn't.

"It's the radiation that the bombs left. It seeps into everything.

The islands plants are laden with caesium-137, a cancer causing isotope.

Residents, however, have begun returning slowly to Enewetak Atoll at the US government's urging.

Community elder Alson Kelen grew up on Bikini Atoll.

She said: "Cancers continue from generation to generation.

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“If you ask anyone here if there’s a legacy of nuclear impact on their health, the answer would be yes.

"The Marshall Islands Nuclear Claim Tribunal has a list of cancers that are related to nuclear throughout our people."

a small island in the middle of a large body of water
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The dark-coloured bay-like area is a crater created by a 1954 U.S. hydrogen bomb testCredit: Getty - Contributor
a black and white photo of a mushroom cloud over a body of water
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An atomic bomb test explosion off Bikini AtollCredit: Hulton Archive - Getty
a group of men are looking at a huge cloud in the sky
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It was also the site the hydrogen bomb was detonatedCredit: AP:Associated Press
a large mushroom cloud rises over the ocean
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The bombings began in 1946 at the start of the Cold War and ended in 1958Credit: Getty
a scuba diver is swimming in the ocean near a lantern
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The seafloor is littered with remnants of the explosionsCredit: Getty
a shipwreck sits in the middle of the ocean
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Nuclear test facility debris is seen at Bikini Atoll in 1996Credit: Getty
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