Tragic last moments of man recorded as he was dissolved in acid leaving behind just phone and wallet

When it comes to the worst ways to die, being skinned alive and drowning both sound pretty brutal.

However, boiling alive then dissolving in acid might be one of the most horrendous.

Colin Scott was visiting the Porkchop Geyser in Yellowstone National Park in the US with his sister Sable when a tragic accident happened.

The pair ignored warning signs and hiked into a prohibited area of the park to have an illegal swim.

Sable videoed her 23-year-old brother stepping off the Norris Geyser Basin’s boardwalk. However, as he searched for the perfect spot, Colin slipped and fell into the scorching water.

There, his body was boiled alive before the acidic waters caused it to dissolve, leaving just his shoes and wallet intact.

Sable's phone recorded the moment he fell, as well as her desperate attempt to rescue him.

The video footage has never been released but is kept on file by police.

Colin Scott was looking for somewhere to go for a swim when he slipped and fell into a scorching hot spring (Colin Scott/Facebook)

After the accident, Sable ran to a nearby museum to get help, but by the time she returned with several park rangers, it was too late.

They could see portions of Colin's head, torso and hands floating in the hot spring, which is said to have reached 100 degrees celsius - boiling point.

The police report from 2016 states: "Due to the report of the individual not previously visible, a lack of movement, suspected extreme temperatures, and indications of several thermal burns, the subject was determined to be deceased."

Due to an incoming storm, rangers were unable to retrieve Colin's body right away.

When they returned the following day, he had disappeared.

It is believed that has body had dissolved overnight, leaving behind just his wallet and flip flops.

His body dissolved in the acidic water, leaving behind just his wallet and flip-flops (Patrick Gorski/NurPhoto via Getty Images)

The report reads: "The consensus among the rescue/recovery team … was that the extreme heat of the hot spring, coupled with its acidic nature, dissolved the remains."

Speaking of rough ways to go, a Japanese man is said to have suffered the most painful death imaginable after being exposed to radiation.

Hisashi Ouchi was a technician at the Tokaimura Nuclear Power Plant, about 90 miles northwest of Tokyo.

In 1999, disaster struck when a miscalculation caused uranium he was pouring into a metal vat to reach 'critical point,' releasing dangerous neutron radiation and gamma rays into the air.

Ouchi absorbed 17 Sieverts (sv) of radiation - the highest amount of radiation taken on by a single living person - and quickly became very unwell.

After 83 days of torture in which he 'cried blood' as his 'skin melted,' Ouchi died as a result of multiple organ failure.

Stay safe!