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VERTICAL 170 A survey is the only way you can find out how deep your cave is and where it is going. It is a guide that indicates where to look for a continuation or passages that are likely to connect
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Document Date: 2007-09-05 08:24:11
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VERTICAL 170 A survey is the only way you can find out how deep your cave is and where it is going. It is a guide that indicates where to look for a continuation or passages that are likely to connect