A woman unintentionally captured the gruesome moment her brother's fatal fall into a hot spring.
The heartbreaking tragedy took place on June 7, 2016, at Yellowstone National Park, which is one of the most popular tourist spots in the country.
Colin Scott, 23, and his sister Sable, from Oregon, disobeyed regulations and hiked into the Porkchop Geyser to find a place to “hot pot," which is the illegal practice of swimming in one of the park’s thermal features.
The siblings' day out quickly turned into a devastating accident as Scott unitentionally "slipped and fell" into the scalding pool after reaching down to check the water temperature, according to The Guardian.
Sable was filming the duo intentionally walking off the Norris Geyser Basin’s boardwalk when her brother fell in, as reported by the outlet.
“The smartphone recorded the moment he slipped and fell into the pool and her efforts to rescue him,” the report said.
As there was no signal at the basin, Sable ran towards a nearby museum to inform the park warden. But by the time she got back, there was nothing more that could be done as all that was left in the hot spring was her brother's head, upper torso, and hands.
“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,” US park ranger Phil Strehle wrote in a report.
Strehle reported spotting a V-neck T-shirt and "what appeared to be a cross was visible and resting on the subject's face" in a separate account.
Scott's body could not be recovered safely due to the "volatile" nature of the thermal area and an incoming lightning storm.
When officials returned the following morning, his body was no longer visible. Only his wallet and flip-flops were left behind.
Per BBC News, it is suspected that Colin had been completely dissolved overnight, with the report adding: "The consensus among the rescue/recovery team...was that the extreme heat of the hot spring, coupled with its acidic nature, dissolved the remains."
Usually, the water temperatures at the basin are around 199F, but during the attempt to retrieve the victim's body, the pool was measured at a scorching 212F, which is the boiling point, per The Mirror.
The area of the park where the horrendous casualty took place is on the edge of the renowned Yellowstone caldera, a "supervolcano" or "hotspot," per BBC.
The caldera's activity fuels the thermal pools in the area and it also has the potential for a "cataclysmic" explosion which would alter global climate for decades.
Yellowstone's deputy chief ranger Lorant Veress told KULR 8, which broke the story, that the whole area is "geothermally active," adding: "There's a closure in place to protect people from doing that for their own safety. It's a very unforgiving environment."
The video footage has never been released but is kept on file by police.