MinuteEarth

How Deep Can Caves Get? (2025x17)

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Krubera Cave, one of our planet’s deepest known caves, extends 2200 meters into the earth – that’s a depth of nearly six Empire State Buildings. Or at least, that's as far down as humans have been able to explore; there might be other undiscovered chambers that go down even farther. But the cave can't be that much deeper, because there's a limit – actually, three limits – to how deep caves on Earth can get.