Miners wasted little time, energy and space tunneling their way to the lodes which formed, and later cooled as a vertical layer, on account of heat and pressure thousands/millions of years ago at the edge of the molten metamorphic rocks.
As may be seen from the water, they're not going to be able to reopen Geevor as a viable mine in spite of, I believe, recent rises in the value of tin and copper because the underground labyrinth which extends under the seabed is flooded and pumping it out would cost vast sums.
It's hard to envisage, I agree, but it wouldn't be the first time in history that a flooded mine was forked (i.e. drained) when the value of the tin ore left underground made it viable to reopen the mine.
I dare say that as miners once worked the shafts with only ten feet separating them from water above which they heard as boulders rolled about on the sea bed, so they said, some of the sea will have flooded in through collapsed rocky ceilings making it an almost impossible job.
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