1061: Half Hour Hole
La Secada
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Entrance is on the uphill side of the road, some 100m past the 21km stone to Fuente las Varas. A dig above Cueva de Bollón (098) which has some draught and stones rattling down.

Reference: anon., 1995c (logbook)
Entrance picture :
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Line Survey :
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Survex file :