Arctic Cavern
=============

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