The Diver Questline in Abyss is one of the longest and most important progression chains in the entire game. Unlike normal quests that focus on combat or exploration, these missions revolve around transporting cargo across the ocean while dealing with weight limits, oxygen management, and increasing difficulty.
Many players underestimate this questline at first, but completing it unlocks powerful tube upgrades, large amounts of currency, and essential resources needed for late-game progression.
This guide explains where to find the Diver, how the delivery system works, and every mission requirement so you can complete the entire chain efficiently.
Where to Find the Diver
The Diver NPC is not located inside a town or base like most quest givers. Instead, he is positioned in the open ocean near the early game biome.
To reach him, start from the Forbidden Deep area and locate the leaderboard structures. From there, look out into the water behind them. In the distance, you will see a yellow submarine floating on the surface.
Swimming northwest from the Forbidden Deep will lead you directly to the Diver, who sits on top of this submarine.
How Diver Quests Work
All Diver missions follow the same core mechanic: you must deliver cargo to specific NPCs across the map.
However, the difficulty increases steadily because each mission increases the weight of the cargo you must carry. This means that upgrading your tube is not optional. Without stronger tubes, you will eventually reach a point where you physically cannot complete deliveries.
In addition to weight challenges, longer missions also require careful oxygen management, since heavy cargo slows movement and increases travel time.
Why Diver Quests Are Important
Completing the Diver questline provides several major benefits.
You receive large amounts of money, star shards, oxygen pods, and potions throughout the missions.
More importantly, certain milestones unlock powerful tube upgrades that significantly increase your carrying capacity and depth potential.
Without these upgrades, reaching late-game zones becomes extremely difficult.
All Diver Quests and Requirements
There are fifteen total missions in this questline, each progressively harder than the last.
The early quests are relatively simple and mainly introduce the delivery system.
The first mission requires delivering a small five-kilogram cargo box to Henry, rewarding a modest amount of money and star shards.
The second mission increases the weight to ten kilograms and sends you to Richard, continuing the pattern of gradually increasing load sizes.
By the third mission, you begin delivering multiple packages to different NPCs in a single quest, forcing longer travel routes.
Mid-Tier Missions (Quests 4–8)
Once you reach the middle of the questline, the difficulty begins to rise sharply.
Cargo weight increases significantly, sometimes reaching forty kilograms or more per delivery.
These missions also introduce larger rewards, including oxygen pods and potions that help offset the increased difficulty.
One of the most important milestones occurs around the fifth mission, where you unlock access to the Zeppelin Tube. This tube greatly improves carrying capacity and is essential for continuing the questline.
Advanced Missions (Quests 9–12)
At this stage, deliveries often involve multiple heavy cargo packages sent to several NPCs across the map.
Some missions require transporting over one hundred kilograms at once, which demands upgraded tubes and careful route planning.
Rewards also become much more valuable, including large sums of money, advanced oxygen pods, and powerful potions that improve speed or drop rates.
Completing these missions often feels like endurance challenges rather than simple deliveries.
Final Missions (Quests 13–15)
The final missions represent the peak difficulty of the Diver questline.
Cargo weight becomes extremely high, sometimes exceeding two hundred kilograms. Without fully upgraded tubes, these deliveries are nearly impossible.
The last mission serves as the ultimate reward milestone, unlocking the Plane Tube. This tube provides massive carrying capacity and represents one of the strongest upgrades available in the game.
Although details of the final missions may vary slightly, the core challenge remains consistent: managing extreme weight while maintaining oxygen and navigating long distances.
Upgrading your tube regularly is the most important factor for success. Attempting later missions with outdated equipment will result in failure.
Always plan efficient routes before starting deliveries to minimize travel time.
Carry oxygen pods whenever possible, especially for heavier missions that slow movement.
Use speed potions during long-distance deliveries to reduce risk and save time.
Treat the questline as a long-term progression system rather than trying to rush through it quickly.
The Diver questline is one of the most demanding but rewarding progression paths in Abyss. While it requires patience, resource management, and steady upgrades, completing it provides essential tools and unlocks that dramatically improve late-game gameplay.
Players who invest the time to finish all fifteen missions gain a major advantage in carrying capacity, exploration depth, and overall efficiency.