basically we mine potash (k20) which is used in fertilizers, all of our main tunnels are mined in salt which is more stable (what gets put on the roads in winter) we sell it a byproduct.
we are about 9 km out under the north sea and about 7 km inland, its hard hot dusty work and quite dangerous , but it pays ok.
oh yeah every car ive had rusts to feck because of this place .