Chapter 1: Into the Blue Hole
1.1 Opening — Welcome to the Blue Hole
The game begins with Dave receiving an invitation from his old friend Coban to visit the Blue Hole area. Coban introduces Dave to the unique ecosystem — the marine life here is incredibly diverse, making it a paradise for fishing. Dave also meets Bancho, a sushi chef, and the two decide to run a sushi restaurant together.
💡 Beginner Tip
Chapter 1 is a tutorial chapter. Just follow the game's guidance. Focus on: basic diving controls, harpoon usage, and basic sushi restaurant operations.
1.2 First Dive
Enter the shallow water zone (0-30m). The system teaches basic controls: movement, aiming, and using the harpoon to catch fish. Prioritize catching Clownfish, Butterflyfish, and other small species — they don't sell for much but are easy to catch and help you accumulate your first funds.
- Recommended catches: Clownfish (80G), Blue Tang (120G), Red Snapper (160G)
- Watch your oxygen: The starting oxygen tank is limited. Don't get greedy — return to the surface in time.
- Weight limit: Starting backpack capacity is small. Prioritize keeping higher-value fish.
1.3 First Sushi Restaurant Opening
After your first dive, Bancho teaches you to make basic sushi. Hand over your catch and he'll prepare sushi for your first customers. The first opening is relatively simple, designed to familiarize you with the restaurant management flow.
✅ Management Tip
In early game, focus on Red Snapper Sushi (350G) and Salmon Sushi (450G) — good profit margins with simple preparation. Save money quickly to upgrade your menu and shop.
1.4 Weapon Upgrade — Harpoon Enhancement
After earning your first money, prioritize upgrading the harpoon. The basic harpoon can only catch small fish. Upgrading allows you to catch medium fish (Parrotfish, Octopus) which sell for significantly more.
Recommended upgrade order: Harpoon Damage → Oxygen Tank Capacity → Diving Suit
1.5 Chapter 1 Boss — Giant Octopus
At the end of Chapter 1, you'll face the Giant Octopus boss. It shoots ink to obscure your vision and attacks with its tentacles.
🐙 Boss Strategy: Giant Octopus
1. Keep medium distance — don't get too close
2. After it shoots ink, it emerges from the side — watch the ink edges
3. Tentacle attacks have a wind-up (tentacle raises) — dodge sideways
4. Use an upgraded harpoon gun — about 8-10 hits to defeat
5. Defeating it rewards the Booster blueprint
Chapter 2: Deep Sea Mystery
2.1 Exploring Mid Waters (50-130m)
With the booster and upgraded oxygen tank, you can now dive into deeper mid waters. Larger fish appear here: Tuna, Marlin, Grouper, and more. These are not only premium sushi ingredients but sell for far more than shallow-water fish.
⚠️ Caution
Dangerous creatures appear in mid waters (sharks, etc.). Avoid them when under-equipped. Jellyfish tentacles are poisonous — keep distance and use ranged attacks.
2.2 The Beluga Mystery
While exploring mid waters, you receive a mysterious sonar signal. Following it leads to an injured Beluga Whale. This is a key story beat in Chapter 2 — you must help the whale while uncovering secrets of the deep sea.
Note: The Beluga cannot be attacked. You must photograph it with your camera to complete the quest. It is a protected species in the game.
2.3 Unlocking the Farm
After completing the Beluga quest line, you unlock the farm system. The farm allows you to grow rice, vegetables, and other ingredients needed for the sushi restaurant, significantly reducing operating costs.
✅ Farm Tip
Prioritize growing rice (base ingredient for sushi rice), then nori and seasoning vegetables. Self-sufficiency saves huge purchasing costs — profits can double.
2.4 Chapter 2 Boss — Tiger Shark
🦈 Boss Strategy: Tiger Shark
1. Attack patterns: Charging bite (straight line), Tail sweep (AoE)
2. Dodge sideways when it charges, then counter with harpoon gun
3. Before tail sweep, it visibly winds up — quickly back away
4. Recommended: Advanced harpoon gun + at least Lv.2 diving suit
5. About 15 hits needed. Be patient — don't get greedy.
Chapter 3: Sushi Master
3.1 Full Restaurant Upgrade
Chapter 3 is the core restaurant management chapter. You should have accumulated enough funds by now to fully upgrade: expand the dining area, add more seats, and hire new staff.
3.2 Staff Hiring Guide
Staff are key to restaurant success. Recommended hiring order:
| Priority | Staff | Role | Reason |
|---|
| ⭐⭐⭐⭐⭐ | Elnino | Chef | Advanced cuisine specialist, can develop special recipes |
| ⭐⭐⭐⭐ | Dmitri | Server | Can serve VIP guests, boosts restaurant rating |
| ⭐⭐⭐⭐ | Sato | Chef | Pufferfish cuisine expert, rare recipes |
| ⭐⭐⭐ | Sean | All-rounder | Flexible fill-in for both chef and server roles |
3.3 Recipe R&D Strategy
Recipe research requires specific fish and ingredients. New recipes expand your menu variety, attract more customers, and increase per-customer spending.
- Early game (Ch.1-2): Red Snapper Sushi, Salmon Sushi — low cost, high profit
- Mid game (Ch.3): Tuna Sushi, Grouper Sashimi — high price, high rating
- Late game (Ch.4-5): Pufferfish Sashimi, Anglerfish Hot Pot — top-tier cuisine
✅ Money Tip
Check inventory before opening each day. Prioritize your highest-priced dishes on the menu. Using farm-grown ingredients saves 30-50% on costs.
3.4 Chapter 3 Boss — Giant Squid
🦑 Boss Strategy: Giant Squid
1. Releases ink to create dark zones — use Glow Stone for visibility
2. Tentacle grab attack → rapidly press the escape button
3. Weak spot is behind the head — circling behind deals double damage
4. Recommended: Advanced harpoon gun + Booster (for quick flanking)
5. Defeating it rewards the Advanced Net recipe
Chapter 4: Ocean Legends
4.1 Deep Sea Exploration (130-250m)
Chapter 4 unlocks the deep sea zone. The deep sea is completely dark — you need Glow Stones or submersible lights to see your surroundings. The deep holds many high-value fish, but is also full of danger.
⚠️ Deep Sea Warnings
1. Oxygen depletes faster at depth (pressure effect). Ensure oxygen tank is maxed out.
2. Easy to get lost in the dark — note terrain landmarks.
3. Deep-sea sharks, Giant Squid, etc. are extremely dangerous. Don't engage without proper gear.
4.2 Ancient Ruins Exploration
Around 150m depth, you'll discover the entrance to ancient ruins. The ruins contain multiple chambers with puzzles to unlock passages. Rare weapon blueprints are hidden deep inside.
- Layer 1: Use bombs to blast open the blocked entrance
- Layer 2: Step on glowing floor plates in the correct order (hints on wall murals)
- Layer 3: Defeat the guardian automaton (weak spot is the red core on its back)
4.3 Legendary Fish — Sea Dragon
After collecting 80%+ of the fish guide, the legendary Sea Dragon may appear in the deep hydrothermal vent area. One of the hardest fish to find in the game.
🐉 Sea Dragon Conditions
Night only | Deep hydrothermal vents (150-250m) | Requires max-level harpoon gun | Extremely high damage if hit | Sedate first, then capture
4.4 Chapter 4 Boss — Giant Squid (Legendary)
🦑 Boss Strategy: Giant Squid (Legendary)
1. One of the strongest sea creatures in the game — prepare thoroughly
2. Recommended: Max harpoon gun + Max diving suit + Large oxygen tank + multiple Med Kits
3. Phase 1: Tentacle attacks — focus on one tentacle until it retracts
4. Phase 2: Ink + charge combos — use booster to keep distance
5. Weak spot: Between the eyes, about 20 hits to defeat
6. Save before challenging!
Chapter 5: Final Challenge
5.1 Ultimate Restaurant Rating
In Chapter 5, your sushi restaurant faces its final evaluation. A food critic will anonymously visit — their rating directly impacts your ending.
- Ensure at least 3 five-star dishes on the menu
- Assign Dmitri as server (VIP specialist)
- Elnino + Sato as the dual-chef team
- Use your best ingredients — don't hold back
5.2 Secrets of the Deepest Blue Hole
The final diving mission takes you to the deepest part of the Blue Hole (250m+). Here lies the core secret of the Blue Hole ecosystem — and the final boss.
In the final area, solve an environmental puzzle — activate three ancient devices to open the door to the final boss. The devices are located in three separate deep-sea caves.
5.3 Final Boss — Megalodon
🦈 Final Boss: Megalodon
Preparation:
· Full set of max-level equipment (weapon/armor/oxygen/booster)
· At least 5 Med Kits and 2 spare oxygen tanks
· Stock up on high-value fish first to ensure ample funds
Phase 1 (100%-60% HP):
1. Attack patterns: Charging bite, tail sweep, rock throw
2. Dodge sideways on charges and counter to the head — ~2 second attack window
3. Tail sweep is telegraphed by the shark turning its head toward you → immediately swim up
Phase 2 (60%-30% HP):
1. New skill: Whirlpool pull (drags you toward it) + close-range combo bites
2. Use booster in the opposite direction to escape the pull
3. Falling rocks appear — watch and dodge
Phase 3 (30%-0% HP):
1. Berserk mode — attack frequency doubles
2. New skill: Full-screen shockwave (hide behind rocks to avoid)
3. Attack windows are shorter — stay patient, don't greed for extra hits
4. The final hit triggers the ending cinematic
Expect 30-45 effective hits throughout the fight. This is a battle of endurance.
5.4 Post-Game Content
After defeating the final boss, the game continues. You can:
- Complete 100% fish guide collection
- Upgrade the sushi restaurant to max level
- Unlock all hidden recipes
- Explore new areas previously inaccessible
- Complete all remaining NPC side quests
🎉 Congratulations!
Finishing the story is just the beginning! Dave the Diver has tons of collectibles and hidden content to discover. Return to the homepage to check the fish guide, side quests, and management tips. Continue your Blue Hole adventure!