Undersea Tunnel B1 iz_dun00 Dungeon Midgard Byalan IslandWorld map: Lv 11~50Monsters Lv 1–21 N 400 × 400 cells · Warp portals: 3 On the world map: Undersea Tunnel F1 (Midgard) Map rules No memo Monsters 6 Black Mushroom Lv 1×5⟳ 3 min – 4 min 30 s Plankton Lv 10×65 Kukre Lv 11×15 Hydra Lv 14×15 Vadon Lv 19×15 Marina Lv 21×45 Exits 2 Byalan Islandizlu2dun Field Undersea Tunnel B2iz_dun01 Dungeon