[
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel",
    "name": "cavern",
    "color": "light_blue",
    "see_cost": "spaced_high",
    "spawns": { "group": "AFS_GROUP_FAUNA_TUNNELS", "population": [ 4, 10 ], "chance": 30 },
    "flags": [ "LINEAR" ]
  },
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel_sinkhole_surface",
    "name": "sinkhole ",
    "sym": "v",
    "color": "light_blue",
    "flags": [ "REQUIRES_PREDECESSOR" ],
    "see_cost": "all_clear"
  },
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel_sinkhole",
    "name": "cavern",
    "sym": "^",
    "color": "light_blue",
    "spawns": { "group": "AFS_GROUP_FAUNA_TUNNELS", "population": [ 4, 10 ], "chance": 20 },
    "see_cost": "medium"
  },
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel_ravine_edge",
    "name": "cavern",
    "color": "light_blue",
    "sym": "v",
    "see_cost": "all_clear",
    "flags": [ "RAVINE_EDGE" ]
  },
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel_river",
    "name": "underground river",
    "color": "blue",
    "see_cost": "spaced_high",
    "spawns": { "group": "AFS_GROUP_FAUNA_TUNNELS", "population": [ 4, 10 ], "chance": 30 },
    "flags": [ "LINEAR" ]
  },
  {
    "type": "overmap_terrain",
    "id": "afs_tunnel_river_start",
    "name": "underground river",
    "color": "light_blue",
    "sym": "o",
    "see_cost": "spaced_high"
  },
  {
    "type": "overmap_terrain",
    "id": [
      "afs_tunnel_lake1",
      "afs_tunnel_lake2",
      "afs_tunnel_lake3",
      "afs_tunnel_lake4",
      "afs_tunnel_lake5",
      "afs_tunnel_lake6"
    ],
    "name": "underground lake",
    "sym": "#",
    "color": "cyan",
    "spawns": { "group": "AFS_GROUP_FAUNA_TUNNELS", "population": [ 4, 10 ], "chance": 80 },
    "see_cost": "none"
  }
]
