Silver Mine
===========

+-- Ground level --------------------------------------------------------------------------+
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|                                 *        *--*--C     *--*                                |
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|                                 *                          *--*--*--*--*--*              |
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|                                    *                                      *              |
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|                                       *--*--*--*--*                       *        C     |
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|                           *--*                          *              *--*           *  |
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|   C                    *                                *           *                 *  |
|    \                   |                                |           |                /   |
|     \                  |                                |           |               /    |
|      *--*--*     *--*--*                                *           *              *     |
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+------------------------------------------------------------------------------------------+