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Magnus Midtbø entered Mossdale after the sealed cave reopened

Ten cavers went in during a 1967 storm in the Yorkshire Dales; six drowned and the entrance stayed closed for decades until families agreed to limited access.

In a video posted Aug. 18, 2026, Magnus Midtbø descended Mossdale in the Yorkshire Dales with cameraman Sam and caver Simon Brooks, who had captured some of the only known footage from the system and invited him after weeks of planning. Midtbø had stalled at the offer because flash floods had killed six men there in 1967, but he and Sam committed once Brooks mapped the trip toward Four Ways, a deep section where new passages might begin.

The voiceover on the upload recounts how ten experienced cavers entered on a clear forecast in 1967 while four turned back and six pushed deeper. A thunderstorm flooded the passages within about an hour, blocking rescue at the entrance and drowning all six despite a four-day pumping effort. Recovering the bodies was judged too dangerous, so they remain underground and authorities sealed the entrance with concrete until talks with the victims' families restored access a few years ago.

At the surface the team passed a memorial and noted the old entrance had collapsed, forcing a new route past shifted boulders. Brooks told Midtbø that almost nobody visits anymore and that summer thunderstorms still make the dry passages lethal within roughly an hour if rain hits the moor. Midtbø called it the most scared he had been for a video and said the crew was trusting the forecast with their lives.

Inside, they crawled for half an hour through a long squeeze with no room to turn around while Midtbø told Brooks, "This is the worst thing I've ever done." They eventually reached the swim section near their target, several kilometers in. Midtbø agreed with Brooks that they should "try to rush out before we not spend too much time here in case it starts raining," and they abandoned further exploration. On the way out Midtbø thought the water sounded louder and the group moved quickly rather than test whether levels were rising.

Source video: The Most Dangerous Cave in the World...