🐬 Dolphin Rescue
| Chapter | Chapter 1 |
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| Trigger | Automatically triggered when exploring the shallow coral reef — find a dolphin tangled in a fishing net |
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| Location | Shallow Coral Reef (0-30m) |
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| Reward | Booster Blueprint, 500 Gold |
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Steps
- Hear dolphin cries in the shallow coral reef area — follow the sound to find a dolphin caught in a net
- Use your harpoon to cut the net (get close and press the interact button)
- The freed dolphin swims around you in gratitude and leaves behind an item
- Pick up the item to obtain the Booster Blueprint
- Return to the sushi bar and talk to Bancho to trigger the booster crafting scene
✅ Tip
The Booster is one of the most important early-game items, significantly boosting underwater movement speed. Complete this quest ASAP.
🐋 Finding the Beluga
| Chapter | Chapter 2 |
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| Trigger | Receive a mysterious sonar signal while exploring mid waters |
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| Location | Polar Waters (special stage) |
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| Reward | Beluga Photo, 2000 Gold |
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Steps
- While diving in mid waters (50-130m), the system alerts you of an abnormal sonar signal
- Follow the signal direction to enter the Polar Waters special stage
- Find the Beluga Whale and photograph it with your underwater camera
- Note: the Beluga cannot be attacked! Just photograph it
- Return and deliver the photo to the researcher NPC
⚠️ Warning
Polar waters are extremely cold. Oxygen depletes at 1.5x the normal rate. Ensure your oxygen tank is upgraded before attempting.
🚢 Shipwreck Treasure
| Chapter | Chapter 2 |
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| Trigger | Discover a shipwreck at approximately 80m depth in mid waters |
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| Location | Mid Waters (80m) |
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| Reward | Ancient Coin, Treasure Fragment x10 |
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Steps
- Find the shipwreck at around 80m depth in mid waters
- Use bombs to blast open the entrance (prepare bombs in advance)
- Enter the shipwreck and explore 3 compartments
- Each compartment has a treasure chest with simple puzzles (push blocks / pull levers)
- Collect all chests for the rewards
💡 Treasure Fragments
Treasure Fragments are important collectibles. Save up enough to exchange for rare weapons and equipment at the shop. 10 fragments can be traded for an Advanced Harpoon Gun.
🐡 Pufferfish Challenge
| Chapter | Chapter 2 |
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| Trigger | A special guest visits the sushi bar and requests pufferfish cuisine |
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| Location | Shallow Coral Reef |
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| Reward | Pufferfish Recipe, Sato joins the team |
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Steps
- A mysterious guest arrives at the sushi bar and demands pufferfish dishes
- Head to the shallow coral reef to hunt for Pufferfish
- Key: Pufferfish inflate when attacked and become uncapturable. Must be killed in a single hit with a high-damage weapon.
- Return with the catch to the sushi bar
- Bancho prepares Pufferfish Sashimi. The satisfied guest's visit leads to Sato joining your team.
✅ Pufferfish Capture Tip
Use a harpoon gun upgraded to at least Lv.3 for a one-hit kill. Alternatively, use the tranquilizer gun to sedate first, then capture. Pufferfish appear during the day in the shallow coral reef.
🦈 Shark Tracking
| Chapter | Chapter 3 |
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| Trigger | Talk to the marine research institute NPC |
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| Location | Deep Sea |
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| Reward | Advanced Harpoon Gun, 1500 Gold |
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Steps
- Talk to the researcher at the marine institute to accept the shark tracking mission
- Install tracking devices (get close to a shark and press interact) — approach without getting attacked
- Use the tranquilizer gun to put sharks to sleep before installing trackers — safest approach
- Track 3 different shark species: Hammerhead, Tiger Shark, and Deep-sea Shark
- Return to the institute after completing all three
⚠️ Safety Warning
Sharks deal extremely high damage. Equip at least a Lv.2 diving suit. The tranquilizer gun is the safest method — don't try to fight them head-on.
🐉 Legendary Sea Dragon
| Chapter | Chapter 4 |
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| Trigger | Fish guide completion rate above 80% |
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| Location | Deep Hydrothermal Vents |
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| Reward | Sea Dragon Photo, Achievement: "Lord of the Sea" |
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Steps
- Ensure you've collected at least 28 out of 35 fish species
- Visit the deep hydrothermal vents (150-250m) late at night
- Wait near the vents — the Sea Dragon has about a 30% spawn chance per dive
- When it appears, photograph it with your camera (cannot attack — legendary protected creature)
- Taking the photo earns you the "Lord of the Sea" achievement
💡 Spawn Rate Tip
Use the Fish Finder to check if rare creatures are present. If no special reading appears, return to the surface and dive again to reset the spawn table.