Discover caves like this, it means a signal that can be created by the roof by high pressure gas or magma. Sometimes, with some frequency, the roof can collapse and gas or magma, or both may leave abruptly. It is believed that in Yellowstone Park in the U.S. (home to Yogi Bear) is one of the vaults, but huge in size, more than five kilometers in diameter. Yet if this is expected to explode violently with catastrophic global consequences
More worth studying geology to understand and prevent this kind of phenomena (possible slaughter). But calm, enjoy these days before they see the gate of hell.
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