If one were to happen upon a large cavern deep underground, are there any laws that dictate how deep underground a country's claim to land can be? Would it be possible to declare the area an independent country?
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Cuius est solum, eius est usque ad coelum et ad inferos. This is a (somewhat discredited) principle in property law, but I seriously doubt that any country would countenance a subterranean claim of sovereignty beneath its own sovereign territory. – phoog Oct 03 '17 at 19:26