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Mossdale Cave, sealed after six cavers drowned in 1967, draws Magnus Midtbø for a rare descent

The Yorkshire Dales system flooded in under an hour during the historic disaster. Families later helped reopen access that most cavers still avoid.

Mossdale in the Yorkshire Dales is widely treated as one of the most dangerous caves in the world and carries the worst recorded caving disaster in history. In 1967 ten young men entered on a clear forecast while the passage was already feared for unstable rock, ceiling collapses, tight navigation, and flash flooding. Four turned back; six went deeper. A thunderstorm sent water through the system so fast that rescuers could not re-enter the entrance in time. Hundreds worked for days to lower flood levels; all six were found dead. Recovery inside was judged too risky, the bodies were left where they were, and the cave was sealed with concrete for decades until talks with the victims’ families restored limited access.

Even after reopening, few people go in. A local guide who is one of only two people known to have filmed underground there invited Magnus Midtbø, who went with cameraman Sam after long planning. Near the site they passed a memorial to those who died. The old entrance has collapsed; the team used a newer route around the corner. The guide said he has taken only a handful of people in and that more humans may have been to outer space than to the bottom of Mossdale.

Midtbø said the shoot was the most frightened he had ever been on video because the trip depended entirely on the weather forecast being right; wrong rain would reflood the cave on the same pattern that killed the six in under an hour. Their target was Four Ways, among the deepest sections and a logical stop before unexplored passage, on a push he said would take about seven hours. Summer thunderstorms were the main worry; it had clouded and rained lightly earlier that day, though the forecast called for no further rain.

Underground they moved through passages where boulders had shifted since prior trips, then into long crawls with no room to turn around for hundreds of meters. Midtbø described the tightest stretch as the worst caving he had ever done. They reached the swim section kilometers in, the point he had set as the goal. They chose not to push farther and to leave quickly given the earlier rain and the rising sound of water on the way out, moving back toward the surface while the guide told him conditions were still acceptable.

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