--------------------------------
--  Initial swimmable blocks  --
--------------------------------
swimmable = {"default:water_source",
			 "default:water_flowing",
			 "default:river_water_source",
			 "default:river_water_flowing",
			 "default:lava_source",
			 "default:lava_flowing"
			}

--------------------------------
--   Initial flyable blocks   --
--------------------------------
flyable = {"air",
		   "default:cloud"
		  }