Undersea Tunnel B5 iz_dun04 Dungeon Midgard Byalan IslandWorld map: Lv 11~50Monsters Lv 14–53 N 280 × 300 cells · Warp portals: 1 On the world map: Undersea Tunnel F5 (Midgard) Map rules No memo Monsters 6 Hydra Lv 14×18⟳ 4 min 54 s – 7 min 51 s Marine Sphere Lv 28×10 Swordfish Lv 30×10 Deviace Lv 47×3 Strouf Lv 48×50⟳ 10 min – 15 min Merman Lv 53×52⟳ 5 s – 2 min 50 s Exits 1 Undersea Tunnel B4iz_dun03 Dungeon