Undersea Cavern
===============

+-- Level +6 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level +5 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level +4 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level +3 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level +2 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level +1 ---------------------------------------------------------------------+
|                                    ^                                            |
|                                    %                                            |
|                                    v                                            |
|                                                                                 |
+---------------------------------------------------------------------------------+

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

+-- Level -1 ---------------------------------------------------------------------+
|                                                                     ^           |
|                                                                     %           |
|                                                                     v           |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level -2 ---------------------------------------------------------------------+
|                                                                     ^           |
|                                                                     %           |
|                                                                     v           |
|                                                                                 |
+---------------------------------------------------------------------------------+

+-- Level -3 ---------------------------------------------------------------------+
|                                                                     ^           |
|                                                                     %           |
|                                                                     v           |
|                                                                                 |
+---------------------------------------------------------------------------------+