Powell's Lode
The tunnel system intersects with many mines as well as several natural cave systems, including the remarkable Powell's Lode Cavern on the Rhosesmor branch tunnel. This is a natural passage at least 100 metres (328 feet) deep, at least 60 metres of which is taken up by a natural lake, though probably much deeper (its full depth is still unknown; thousands of tons of waste rock were dumped into the lake over the years without affecting its level). The cavern can therefore claim to be the highest such natural cavern in the UK.
Read more about this topic: Milwr Tunnel
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