The pond itself is 14m deep, with en enlarged shaft head 65 m deep below it. Then there is a 35m "orifice shaft" before the 443 m plunge from the low pressure tunnel from Marchlyn Mawr down to the high pressure system into the station proper.
This photograph is by grahami and was uploaded October 19th 2007. © grahami please do not copy or distribute without prior express permission.
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