Chiseled Tunnels
================

+-- Ground level --------------------------------------------------------------------------------+
|                                                                                                |
|                           *  *                                                                 |
|                           | / \                                                                |
|                           |/   \                                                               |
|                           *     *                                                              |
|                          /       \                                                             |
|                         /         \                                                            |
|               *     *  *--*--*  *  *                                                           |
|              <      |    /     / \ |                                                           |
|                     |   /     /   \|                                                           |
|                     *--*     *     *                                            *--*--*        |
|                     |       /|                                                   \    |        |
|                   > |      / |                                                    \   |        |
|                  *--*     *  *                 *                                   *  *        |
|                      \       |                  \                                   \          |
|                       \      |                   \                                   \         |
|                        *     *--*                 *           *                       *        |
|                                  \                 \           \                     / \       |
|                                   \                 \           \                   /   \      |
|                                    *     *           *           *     *     *     *     *     |
|                                     \   /           / \         / \    |      \   /            |
|                                      \ /           /   \       /   \   |       \ /             |
|                                       *           *     *     *     *  *        *              |
|                                      / \         /       \   /      |\ |         \             |
|                                     /   \       /         \ /       | \|          \            |
|   *                                *     *--*--*           *        *  *           *           |
|    \                                           |                    |             /            |
|     \                                          |                    |            /             |
|   *--*                                         *                    *           *              |
|    \                                          /                     |          /               |
|     \                                        /                      |         /                |
|      *        *                             *                 *--*--*--*--*  *              *  |
|       \      /|                            /                              |  |             /   |
|        \    / |                           /                               |  |            /    |
|         *  *  *  *--*--*              *--*     *           *              *  *           *     |
|         | /   | /     /                 /      |\         /              / \ |          /      |
|         |/    |/     /                 /       | \       /              /   \|         /       |
|         *     *     *                 *        *  *     *              *     *        *        |
|                    / \               / \       |   \   /                             /         |
|                   /   \             /   \^     |    \ /                             /          |
|                  *     *           *     %--*--*     *                             *           |
|                 /       \         /                   \                           /            |
|                /         \       /                     \                         /             |
|               *           *--*--*--*                    *                       *              |
|                                / \                     /                        |              |
|                               /   \                   /                         |              |
|                              *     *                 *                          *              |
|                                     \               /                           |              |
|                                      \             /                            |              |
|                                       *     *     *                             *              |
|                                        \   / \   <                             /|              |
|                                         \ /   \                               / |              |
|                                          *     *                             *  *              |
|                                         /       \                           /                  |
|                                        /         \                >        /                   |
|                                       *           *              *--*--*--*                    |
|                                                  /                                             |
|                                                 /                                              |
|                                                *           *                                   |
|                                               /           /                                    |
|                                              /           /                                     |
|                                             *           *                                      |
|                                              \         /                                       |
|                                               \       /                                        |
|                                                *     *                                         |
|                                                 \   /                                          |
|                                                  \ /                                           |
|                                                   *                                            |
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+------------------------------------------------------------------------------------------------+