FLICK THROUGH THE GALLERY ABOVE for a look at what lies beneath the Illawarra and its surrounds.
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Of course these gems represent a tiny fraction of the underground and underwater wealth in the region.
There are the dozens of coal mines with tunnels that stretch for hundreds of kilometres under the escarpment.
Not to mention the gun emplacements and the mythical tunnels said to stretch from Port Kembla to the Five Islands or under Lake Illawarra to the escarpment.
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