Undersea Tunnel B2 iz_dun01 Dungeon Midgard Byalan IslandWorld map: Lv 11~50Monsters Lv 1–23 N 300 × 300 cells · Warp portals: 3 On the world map: Undersea Tunnel F2 (Midgard) Map rules No memo Monsters 7 Black Mushroom Lv 1×10⟳ 3 min – 4 min 30 s Plankton Lv 10×10 Kukre Lv 11×50 Hydra Lv 14×30 Vadon Lv 19×60 Marina Lv 21×15 Cornutus Lv 23×15⟳ 5 min – 7 min 30 s Exits 2 Undersea Tunnel B1iz_dun00 Dungeon Undersea Tunnel B3iz_dun02 Dungeon