There's a place like that in Vietnam too
It's in Ha Long Bay (possibly on Cat Ba island, but my memory is hazy these days). They used the huge caves on the islands to escape the saturation bombing by the septics. One was enormous - they used it as a hosptial if I remember rightly.
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HoratioFellatio Taking the the out of psychotherapist, Tue 20 Nov 2007, 9:22,
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