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15 metres? Given that your average two storey house is much less than 10m tall in total I wouldn't say 15m is "nothing".

I mean that’s a hallway not a “subterranean network”.

You have a 15m high hallway?

By all means, show us the endless network of cavernous tunnels you've hand-dug under your own home, then.

Depth, not length

Ah that changes everything.