Exploring the facility interior in Genshin Impact is the core objective of the Beneath the Lunar Sea world quest, added in version 6.7 (Luna VIII). This guide walks you through every step — how to start the quest, how the Ancient Moon Pearl and Archaeolume Energy mechanics work, how to solve each puzzle inside the facility, and what rewards you get for completing it.
Finishing this quest unlocks the Curtain-Form Blackbody Containment Lab, a meeting point where you can trade Luna Sigils for Primogems, Acquaint Fate, the Luna Treasure Compass, and Borderland Shrine of Depth Keys. It is one of the most rewarding world quests in the Frost Moon area, so do not skip it.
TL;DR — Beneath the Lunar Sea Quest
- This is a Moontide Sea world quest in Genshin Impact version 6.7 (Luna VIII)
- Prerequisite: Complete the Visitors From the Stars world quest to unlock Moontide Sea
- You also need Adventure Rank 20 and Archon Quest Prologue: Act III completed
- To start: find the scared Kuuhenki north of the lab, defeat the sphere enemy, then follow it to the entrance
- The main puzzle uses two mechanics — Ancient Moon Pearls (heavy orbs) and Archaeolume Energy (force used to move and burst objects)
- Complete rewards: 30 Primogems, 2 Hero’s Wit, plus chests inside the facility
- Quest completion unlocks the Ancient Moon’s Remnant offering system at the Curtain-Form Blackbody Containment Lab
How To Unlock the Beneath the Lunar Sea Quest
Before you can start Beneath the Lunar Sea, you need to meet these requirements:
- Reach Adventure Rank 20 or higher
- Complete Archon Quest Prologue: Act III — Song of the Dragon and Freedom
- Complete the Visitors From the Stars world quest, which unlocks the Moontide Sea area and the Frost Moon region in Nod-Krai
Once all three conditions are met, head to the Curtain-Form Blackbody Containment Lab in the southern part of the Moontide Sea. You do not need to talk to any NPC to trigger the quest. Just approach the cave in that area and the quest begins automatically when Paimon notices a group of jellyfish flying into the entrance.
How To Start the Beneath the Lunar Sea Quest
On your way to the cave entrance, you will notice a scared Kuuhenki on the small isle directly north of the Curtain-Form Blackbody Containment Lab. A sphere-like enemy is roaming near it and has it trapped.
Defeat the sphere enemy to free the Kuuhenki. Once free, it will guide you straight to the lab entrance. Follow it to the cave door. This triggers the Beneath the Lunar Sea quest and gives you your first objective: explore the facility interior.
Understanding the Two Core Mechanics
The entire facility runs on two mechanics. You will use them repeatedly throughout every puzzle inside. Learn them now and the rest becomes straightforward.
Ancient Moon Pearl
Ancient Moon Pearls are large, heavy orbs you can push across the floor. They slot into Pearl Power Stations mounted on walls or pedestals, powering gates and mechanisms when properly inserted. You push them by walking into them or by using Archaeolume Energy to guide them into position. When a pearl reaches the socket of a power station, it locks in automatically.
Archaeolume Energy
Archaeolume Energy is a force you absorb from glowing energy points scattered around the facility. Once absorbed, you can deploy it in several ways:
- Pull a Pearl toward you — aim at a Pearl while standing on a ledge above it to float it up into a mechanism
- Shoot a Ripple — launch the energy as a projectile to break barriers, clear rubble, or activate the Back-Up Power Generator
- Detonate near a Pearl — exploding Archaeolume Energy close to a Pearl propels it upward, letting it reach wall-mounted mechanisms without needing to stand above it
If a gate refuses to open at any point, the usual cause is a Pearl that has not fully settled into its mechanism. Reposition the Pearl closer to the socket and reapply Archaeolume Energy before trying again.
How To Explore the Facility Interior — Step-by-Step Walkthrough
Step 1 — Enter the Cave and Reach the First Sealed Gate
Go inside the cave at the lab entrance and follow the path deeper into the facility. Keep moving forward until you reach the first sealed gate. There is a Pearl Power Station beside it. You need to place an Ancient Moon Pearl into it to open the gate.
Look around the chamber for a nearby Ancient Moon Pearl. Push it toward the power station on the wall. If it is out of reach, absorb Archaeolume Energy from a nearby source, then stand on a ledge above the station and pull the Pearl upward toward you. Once the Pearl locks into the station, the gate opens. Go through.
Step 2 — Drop Down and Collect Archaeolume Energy
Past the first gate, follow the path until you reach a ledge. Leap down toward the Moon Energy Pearls floating below. Absorb Archaeolume Energy from one of the nearby glowing sources. Once you have energy loaded, jump and glide toward the northern platform ahead.
Step 3 — Find the Hidden Room Behind the Cracked Wall
From the middle door on the northern platform, turn left. You will see a cracked wall section. Enter behind it to access a hidden side room. Inside, there are enemies guarding the area along with some trapped jellyfish.
Defeat all the enemies inside the room. Clearing them frees the jellyfish, which begin swimming around the chamber. The jellyfish also serve as clues pointing you toward the next part of the puzzle.
Step 4 — Destroy the Rubble With Archaeolume Ripples
After defeating the enemies, locate the pile of stone debris near one of the jellyfish. Absorb Archaeolume Energy and shoot a Ripple directly at the rubble to destroy it. Once the debris is cleared, a large container rises from the center of the room.
Step 5 — Activate the Back-Up Power Generator
With Archaeolume Energy still loaded, aim your Ripple at the Back-Up Power Generator in the room and fire it. This activates the generator.
Step 6 — Destroy the Stacked Stones to Activate the Lift
Absorb Archaeolume Energy again. This time, aim it at the stacked stones near the jellyfish and shoot. The explosion clears the stones and activates a lift. The lift brings down a Material Storage Chest — open it before moving on, as it contains extra rewards. Opening the chest also spawns the Ancient Moon Pearl Launcher, which is the key tool for the next part of the puzzle.
Step 7 — Interact With the Container to Reveal the Launcher
Walk over to the container that rose from the floor and interact with it. This activates the Ancient Moon Pearl Launcher mechanism in the room.
Step 8 — Break the Ceiling Barrier to Release the Pearls
Look up at the ceiling above the launcher. You will see a blue Archaeolume Energy Barrier holding several Ancient Moon Pearls suspended in place. Absorb Archaeolume Energy, then stand on the launcher platform. Aim a Ripple directly at the barrier above and shoot it. The barrier shatters, causing the Ancient Moon Pearls to fall to the floor below.
Step 9 — Load a Pearl Into the Launcher and Fire It
Push one of the fallen Ancient Moon Pearls into the launcher slot. Once it is in position, activate the launcher. This fires the Pearl forward across the room toward the second Pearl Power Station near the main door.
Step 10 — Roll the Pearl Into the Empty Power Station
After the Pearl lands from the launcher, it may not be perfectly aligned with the Power Station. Continue pushing and guiding it — walk into it to roll it, or use Archaeolume Energy to nudge it — until it rolls into the empty Pearl Power Station. The Pearl will lock into place automatically once it reaches the socket.
With both power stations now active, the main door to the meeting point unlocks. You will now see two Power Stations lit up — one that was already filled when you arrived, and the one you just powered. Both together open the final gate.
Step 11 — Activate the Terminal to Complete the Quest
Head through the newly opened door. You will enter a chamber containing an alien-looking tree. Walk past it to reach the Terminal. Interact with it and select the option to activate the facility. A short cutscene plays. When it finishes, the Beneath the Lunar Sea quest is complete.
Quest Rewards
Completing Beneath the Lunar Sea gives you the following rewards:
- 30 Primogems
- Hero’s Wit ×2
- An Exquisite Chest found during the jellyfish room puzzle
- A Material Storage Chest unlocked by activating the lift
On top of the direct quest rewards, you also unlock the Ancient Moon’s Remnant offering system at the Curtain-Form Blackbody Containment Lab. This is the more valuable long-term reward.
What You Unlock — The Curtain-Form Blackbody Containment Lab
After completing the quest, the Curtain-Form Blackbody Containment Lab becomes an active meeting point. You can return here to offer Luna Sigils in exchange for various rewards, including:
- Primogems
- Acquaint Fate
- Luna Treasure Compass
- Borderland Shrine of Depth Keys
The lab can also be upgraded over time by continuing to explore the Frost Moon area and offering more Luna Sigils. To maximize your rewards, explore the Moontide Sea, the Dark Side of the Moon, and the Dunnana Forward Station as well.
Additionally, once you upgrade all 6 Meeting Points in the Nod-Krai region and both Ancient Moon’s Remnants in the Frost Moon to their maximum levels, you unlock a Souvenir Shop at the Voynich Guild in Nod-Krai where you can spend remaining Luna Sigils on extra items.
Tips for Completing the Facility Interior Puzzle
- Learn the two mechanics first. Ancient Moon Pearls are pushed or floated. Archaeolume Energy breaks barriers, clears rubble, and moves Pearls. Once you understand both, nothing in the quest is confusing.
- Open both chests before leaving. The Exquisite Chest and the Material Storage Chest are both found inside the side room during the puzzle. Do not rush past them.
- If a Pearl misses the socket, just push it back into position manually and reapply Archaeolume Energy. There is no fail state — you can retry every mechanic freely.
- The launcher does not need to land the Pearl perfectly. After firing, just guide the Pearl the rest of the way on foot by pushing it forward into the station.
- Shoot the ceiling barrier from the launcher platform. Standing on the launcher gives you the right angle to aim upward at the blue barrier holding the Pearls. If you miss, absorb energy again and try from the same spot.
Beneath the Lunar Sea Quest Context — Luna VIII (Version 6.7)
Beneath the Lunar Sea is one of three main world quests added to the Frost Moon area in Genshin Impact version 6.7, also called Luna VIII. The three quests are:
- Moon Gazing — the main world quest chain that unlocks the Frost Moon region step by step
- Beneath the Lunar Sea — unlocks the Curtain-Form Blackbody Containment Lab offering system
- Origin of the Sequence — unlocks the Nuur Stone Circle offering system
Completing all three quest chains in the Frost Moon area gives you a combined total of 320 Primogems across all quest objectives, in addition to Mora, Hero’s Wit, Mystic Enhancement Ore, and other exploration rewards. This makes the Frost Moon one of the most rewarding new areas in version 6.7.
For more Genshin Impact quest and exploration guides, check out our Yae Miko Story Quest Act 1 Walkthrough and Yae Miko Story Quest Act 1 Chest Locations. If you are working on character builds alongside your exploration, our Bennett Constellations Guide and Keqing Ascension and Talent Materials are good references to have open.
Where to Play Genshin Impact
- Official Genshin Impact Website
- Android — Google Play Store
- iOS — Apple App Store
- PlayStation
- PC — Epic Games Store
- Xbox
Related Genshin Impact Guides
- Bennett Constellations Guide
- Keqing Ascension and Talent Materials
- Diluc Ascension and Talent Materials
- How to Beat Azhdaha Trounce Challenge
- How to Beat Perpetual Mechanical Array
- Yae Miko Story Quest Act 1 Walkthrough
- Genshin Impact Furnishing Blueprint Vendor Locations
Frequently Asked Questions
How do I start the Beneath the Lunar Sea quest in Genshin Impact?
Go to the Curtain-Form Blackbody Containment Lab in the southern part of the Moontide Sea. Approach the group of jellyfish near the cave entrance to auto-start the quest. Before that, find the scared Kuuhenki north of the lab, defeat the sphere enemy near it, and follow the Kuuhenki to the entrance to trigger the initial dialogue.
How do I open the sealed gate in the facility interior?
Push an Ancient Moon Pearl into the Pearl Power Station mounted on the wall beside the sealed gate. To get the Pearl into a wall station, absorb Archaeolume Energy, stand on a ledge above the station, and pull the Pearl upward toward you. When it reaches the socket it locks in automatically and the gate opens.
How do I break the blue barrier on the ceiling in Genshin Impact?
Absorb Archaeolume Energy and stand on the Ancient Moon Pearl Launcher platform below the barrier. Aim upward and shoot an Archaeolume Ripple at the blue Archaeolume Energy Barrier on the ceiling. This shatters the barrier and causes the Ancient Moon Pearls held inside to fall to the floor.
What do I do after the pearls fall from the ceiling barrier?
Push one of the fallen Ancient Moon Pearls into the launcher slot. Activate the launcher to fire the Pearl across the room toward the empty Pearl Power Station. After it lands, continue pushing the Pearl until it rolls into the station socket. Once it locks in, both stations are powered and the final door opens.
What rewards do you get from Beneath the Lunar Sea?
Completing the quest rewards 30 Primogems and 2 Hero’s Wit. You also find an Exquisite Chest and a Material Storage Chest inside the facility during the puzzle. Most importantly, you unlock the Curtain-Form Blackbody Containment Lab meeting point where you can offer Luna Sigils for additional rewards including Primogems, Acquaint Fate, the Luna Treasure Compass, and Shrine of Depth Keys.
What is the Curtain-Form Blackbody Containment Lab in Genshin Impact?
It is a meeting point in the Moontide Sea (Frost Moon) area, unlocked by completing Beneath the Lunar Sea. You bring Luna Sigils collected across the Frost Moon to this location and offer them in exchange for various rewards. The lab can be upgraded over time to increase the rewards available.
Do I need to complete Moon Gazing before Beneath the Lunar Sea?
Yes. The Moontide Sea area — and by extension the Curtain-Form Blackbody Containment Lab — is locked until you progress through the Visitors From the Stars portion of the Moon Gazing world quest. Complete that first, then head to the lab to trigger Beneath the Lunar Sea.
What version of Genshin Impact added Beneath the Lunar Sea?
Beneath the Lunar Sea was added in Genshin Impact version 6.7, also known as the Luna VIII update. It is part of the Frost Moon area content in the Nod-Krai region.
