[
  {
    "type": "overmap_terrain",
    "name": "solid rock",
    "//": "should be indistinguishable from deep_rock.  Not supposed to be able to see it.",
    "id": "labyrinth_hall",
    "sym": "%",
    "color": "dark_gray",
    "see_cost": "high",
    "travel_cost_type": "impassable",
    "flags": [ "LINEAR", "SHOULD_NOT_SPAWN" ]
  },
  {
    "type": "overmap_terrain",
    "name": "solid rock",
    "//": "should be indistinguishable from deep_rock.  Not supposed to be able to see it.",
    "id": "labyrinth_entrance",
    "sym": "%",
    "color": "dark_gray",
    "see_cost": "high",
    "travel_cost_type": "impassable",
    "flags": [ "SHOULD_NOT_SPAWN" ]
  }
]
