Abyss Fish Ruins Guide: Seven Locations and Quest Keys

Seven Fish Ruins are spread across the original Ocean, Ancient Sands, and Spirit Roots areas in Roblox Abyss. Each sealed ruin contains a high-tier treasure chest, but it opens only with the key awarded by a specific NPC quest. Use the locations below with the in-game map; obtain the key for a region before making a long or deep dive.

Update note: Abyss can add areas and ruins after a game update. This guide covers the seven ruins shown in the original three-region route. If your map includes a later region such as Sunken Wilds, treat its ruin as an additional location rather than part of this seven-ruin checklist.

Fish Ruins and key quests at a glance

Keys are tied to their region. Completing one of the listed quests gives you a key for one sealed ruin; it does not open every ruin in that area.

Ocean Fish Ruin locations

1. Behind Virelia

From Virelia, look behind the NPC for a raised rock formation. The Fish Ruin sits on top, making it the easiest one to spot early in the game. Complete the tutorial before following this route so the nearby systems and quests are available.

2. Between the Scientist and Lost Captain

The second Ocean ruin lies on the seabed between the Scientist and Lost Captain. It is deeper than 200 meters, so equip a Tube with enough oxygen capacity and plan a direct return route before descending.

Ancient Sands Fish Ruin locations

3. Behind the Suspicious Fisher

Find the Suspicious Fisher, then look behind the NPC for a tall stone tower. The Fish Ruin is on the top of that formation. Scan upward as you approach; searching only along the seabed makes this one easy to miss.

4. Beside Grumpy Hank's tower

Travel toward Grumpy Hank's tower and inspect the neighboring rock structure. The second Ancient Sands ruin rests on top of the rocks beside the tower, rather than inside the tower itself.

Spirit Roots Fish Ruin locations

5. On the safe dome near Isaac

At the Spirit Roots safe area, locate Isaac and look toward the top of the dome in front of him. The first ruin in this region is above ground level, so use the dome and Isaac as your two landmarks.

6. In the tunnel below Isaac

Open the map near Isaac and find the tunnel running beneath his position. The ruin is below the nearby treasure-chest marker. Enter the lower tunnel and check your depth and oxygen instead of trying to approach it from the surface.

7. Near Golem and the King Cat entrance

Enter Spirit Roots Cave and continue east of Golem. The final ruin in this route is deeper in the cave, shortly before the hidden passage that leads toward King Cat. The cave network can consume more oxygen than the straight-line map distance suggests, so return to a safe area if your Tube is marginal.

How to obtain every key in this route

• Kraken: complete quest 5 for an Ocean key.
• Mr. Black: complete quest 8 for the other Ocean key.
• Marcus: complete quest 5 for an Ancient Sands key.
• Grumpy Hank: complete quest 4 for the other Ancient Sands key.
• Victor: complete quests 4 and 7; each awards a Spirit Roots key.
• Golem: complete quest 2 for the third Spirit Roots key.

Finish the NPC's earlier tasks if the required quest has not appeared. Once you have a key, return to a sealed Fish Ruin and interact with its lock. A key is consumed when the ruin is opened.

Prepare before opening the deeper ruins

• Equip a suitable Tube before visiting the 200-meter Ocean ruin or the Spirit Roots cave.
• Set a nearby NPC, dome, tower, or chest icon as a landmark; the Fish Ruin itself may be hard to identify from a distance.
• Complete the key quest first to avoid repeating a deep dive.
• If a ruin is already open, it may have been unlocked earlier in your current progress.

The chest rewards can include progression resources, but the exact contents may change with game updates. Use the seven locations primarily as a route for the Fish Ruin objective and check the current in-game reward screen for the authoritative result.