The Crab in Roblox Abyss only becomes a proper NPC after you retrieve a specific item: the Ancient Crab Scroll hidden in the Ancient Sands biome. Until you pick up that scroll and hand it over to Henry, the Crab’s chattering is just noise and the related questline stays locked.
Quick answer: Travel from the Forgotten Dome to Ancient Sands, dive to roughly 370m behind Grumpy Hank’s Tower to grab the Crab Scroll from a cave, then return it to Henry in the Forgotten Dome and talk to the Crab to unlock its dialogue and questline.
Crab Scroll location and requirements (Roblox Abyss)
The Ancient Crab Scroll is stored in a deep-sea cave in the Ancient Sands biome, which is the second main zone in Abyss. Reaching it has two hard requirements: access to Ancient Sands and a tube that can safely reach around 370 meters depth.
| Requirement | Detail |
|---|---|
| Biome | Ancient Sands |
| Depth | ~370m (Crab Scroll cave) |
| Tube minimum | Zeppelin Tube or better |
| Landmark | Below and behind Grumpy Hank’s Tower |
Step 1: Use the Teleporter in the Bubble (the Forgotten Dome) to travel to Ancient Sands. When the teleport finishes, you arrive inside Crazy Jeff’s Shop.
Step 2: Leave Crazy Jeff’s Shop and pass through the protective waterfall outside the tunnel. As soon as you clear the waterfall, turn right immediately to follow the correct corridor out into the open area.
Step 3: When the tunnel opens up, look to your left for a tall coral-like tower. This structure is Grumpy Hank’s Tower. You do not need to speak with Grumpy Hank; the tower is used purely as a landmark.
Step 4: Swim behind Grumpy Hank’s Tower and position yourself over the edge of the drop-off next to it. From here, start diving straight down the cliff while staying close to the wall.
Step 5: As you descend and approach the ~370m range, turn the camera back toward the cliff face. A cave entrance is set into the side of the rock wall behind the tower. If you do not see it, adjust slightly up or down along the wall until the opening becomes visible.
Step 6: Enter this cave and swim all the way along the tunnel. The path is straightforward; follow it until it ends in a small chamber with a crab-shaped sculpture holding a scroll.
Step 7: Move up to the sculpture and press E to pick up the Crab Scroll. The item is granted immediately when the prompt appears and you interact with it.
At this point the location step is complete. As long as you left the cave with the scroll successfully in your inventory, you never have to return here for the purpose of unlocking the Crab’s dialogue.
Gear and oxygen needed for the Crab Scroll cave
The Crab Scroll cave sits deep enough that starter gear is not sufficient. The environment around 370m requires at least mid-tier tube equipment and adequate oxygen.
Step 1: Equip a tube that can safely reach at least 370 meters. The game treats the Zeppelin Tube as the minimum functional option for this dive. Higher-grade tubes, such as the Rukiry Tube, provide more comfortable safety margins for depth and mobility.
Step 2: Before using the Teleporter, stock up on Oxygen pods. The route from Ancient Sands spawn to the cliff cave and back is long enough that a low oxygen reserve can force a retreat before you reach the sculpture.
Tip: If you find yourself running out of oxygen on the way back, prioritize ascending first and only then adjust course horizontally toward the Forgotten Dome. Shallower depths reduce risk more quickly than minor detours in the same depth band.
How to make the Crab talk (trigger condition)
Unlocking the Crab as a speaking NPC is a single, fixed trigger: handing the Crab Scroll to Henry in the Forgotten Dome, then interacting with the Crab once the exchange is done.
Step 1: After taking the Crab Scroll from the sculpture, travel back to the Forgotten Dome. Use the same Teleporter you used earlier if you are still in Ancient Sands.
Step 2: In the Forgotten Dome, go to Henry’s Harpoon Shop, where Henry and his Crab companion are located.
Step 3: Stand in front of Henry and press E to start a conversation. The dialogue options will include a specific choice to hand over the scroll.
Step 4: Choose dialogue option “[Give Crab Scroll]”. This option consumes the scroll and completes the unlock condition that ties Henry and the Crab together.
Step 5: Once the dialogue with Henry ends, move to the Crab and again press E to interact.
Step 6: The Crab’s initial responses play as a few clacking sounds before they automatically shift into fully readable English dialogue. When you reach this point, the trigger has fully succeeded and the Crab is now a regular talking NPC for your save.
From here the Crab offers a job, which begins a separate questline involving seven Fish Ruins. That questline sits on top of the same unlock condition; there is no second scroll or alternate requirement for the Crab’s speech.
How to confirm the Crab Scroll trigger worked
You can verify the unlock state quickly without revisiting Ancient Sands.
Step 1: Open a conversation with Henry again. If the scroll has been handed in, the “[Give Crab Scroll]” option no longer appears in his dialogue list.
Step 2: Interact with the Crab. If the scroll has been accepted, all current and future interactions show English text lines rather than only non-verbal crab noises.
Step 3: Check for the start of the Crab questline. The Crab mentions “a job” and offers tasks related to Fish Ruins. The presence of that conversation thread confirms both the scroll and speech conditions are active.
Why the trigger can fail and how to avoid that
The Crab remaining silent after a trip to Ancient Sands always indicates that one of the concrete conditions below was not met.
Missing scroll pickup: Leaving the cave without pressing E on the crab sculpture means the scroll was never collected, even if you saw it. In this case, the Henry dialogue option to give the scroll never appears. The fix is simply to re-enter the cave and interact with the sculpture until the pickup prompt completes.
Scroll not handed to Henry: Holding the scroll in your inventory is not enough. Until you select “[Give Crab Scroll]” in Henry’s dialogue, the Crab cannot switch to readable speech. Always complete the talk with Henry before trying to converse with the Crab again.
Wrong NPC or location: The trigger is tied specifically to Henry’s Harpoon Shop in the Forgotten Dome and to Henry’s dialogue tree. Speaking only to the Crab or to other NPCs in Ancient Sands does not consume the scroll or unlock the Crab.
Once the scroll has been successfully given to Henry, the action does not need to be repeated on that save. The Crab stays unlocked and continues to speak and offer its questline without further trips to Ancient Sands.
