Su Yang is stranded in the vast ocean, struggling to survive with nothing but a dilapidated raft. By a stroke of fate, he awakens an exclusive upgrade system for a ghost pirate ship. He casts his iron hook to salvage drifting supplies, opens mystery boxes to uncover their unknown contents, gathers materials to repair his raft, and unlocks new ship abilities. Along the way, he recruits loyal and formidable skeleton crew members to form an undead maritime squad, ventures into treacherous waters, battles giant sea monsters, and explores mysterious island dungeons. In a world of survival surrounded by towering waves and constant danger, he steadily builds his strength, transforming his humble little raft through successive upgrades until he creates an invincible undead warship that roams the four seas and dominates the entire deep ocean.