Sealed spaces go stale. It is the basic chemistry of a closed system — oxygen depletes, carbon dioxide accumulates, the atmosphere deteriorates over time into something that cannot sustain life. A space sealed for 10,000 years should contain air that would kill you. The cave system beneath the Dinaric Alps that a team of explorers unsealed in September 2022 contained something else entirely.
A Deep Cave System Was Sealed by Rockfall 10,000 Years Ago — The Explorers Who Opened It Found Fresh Air Inside
The cave system, designated DC-7 in the Dinaric Alpine karst region of Slovenia, had been identified as a sealed system through geological survey in 2019.
A rockfall event, dated by the survey team to approximately 10,000 years ago, had blocked the cave's primary entrance entirely. Secondary openings existed — small fissures through which atmospheric exchange was theoretically possible but, based on their dimensions and depth, considered negligible for practical purposes.
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