Their logo is visible on the wall centre-right in this shot:
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And here's the main trunk passage, with a little more coverage - astonishing:
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Equally astonishing is the fact that this is a phreatic tube that dwarfs many of the big ones in Peak Cavern and is at least equal in diameter to Five Arches - suggesting a rather large system somewhere below the floor, as this rises up and sinks again like the back of some huge whale π