Sunken ruins and chests on the seabed hold many Charting the Unknown rewards. We kept only what could be confirmed in text from Inven's sea ruin solutions and chest reports, covering Illiya Island, Karkano Island, the ruin near Nirakan Island and the sea east of Auronoi Island.
Ruin puzzles: Illiya Island, Karkano Island, near Nirakan Island
Chest rewards: Beirpin One-Handed Sword, Priest's Ceremonial Sword and more
Key gear: Propulsion Breathing Device
As of: Nov 7, Inven posts
Note: Some posts show locations only in images
Ruins and Chests at a Glance
Illiya Island sea ruin: burn the vines with light, then press the revealed pattern in order
South of Karkano Island: dash along the big walls with the Propulsion Breathing Device
Ruin near Nirakan Island (south Pywel sea): turn all 15 buttons blue
Chest near Karkano Island: Beirpin One-Handed Sword
Sunken temple chest east of Auronoi Island: Priest's Ceremonial Sword
Illiya Island Sea Ruin (also written Iriya in earlier guides)
Burn all the vines with light so a pattern appears on the wall.
Number the pattern 1 to 5 from the top-left across the upper row and 6 to 8 on the lower row, and remember it.
Touch the switch-like devices on the right in the same order.
The post says Designated Strike's transfer lets you hit the targets quickly.
Underwater Ruin South of Karkano Island
This ruin lies in the sea south of Karkano Island, and the guide likens it to a game of Red Light, Green Light underwater. With the Propulsion Breathing Device you can clear it in about three swims. Dash from the entrance to the big wall ahead and hide, move to the next wall, then dash to the end to finish. Ignore the small walls and stick to the big ones. An earlier guide on this site covers where to find the Propulsion Breathing Device, in a chest in the sea east of Delesyia.
Ruin Near Nirakan Island: 15-Button Puzzle
This ruin is in the south Pywel sea near Nirakan Island. The goal is to turn every button blue and connect the circuit. All 15 tiles start raised, and you press them in the order shown in the post's image. If you press one by mistake, reload and start again. The post warns that Designated Strike sends shock to nearby buttons and often presses extra ones, so get used to its transfer ability first. The exact press order is only in the image, so we could not list it.
Four Underwater Chest Reports
Near Karkano Island: a siren-heavy area. Break the stone-shelled chest with a magic gust or drill to get the Beirpin One-Handed Sword.
East of Auronoi Island: far to the east, a chest in front of the tilted spire at the very top of the sunken Antumbra temple holds the Priest's Ceremonial Sword.
Near Illiya Island: a chest by a sunken structure, with thorns around it. The reward, the Northern Warrior's Throne, is secondhand.
Sion Island: the Abyssal Fang comes from a chest you dig up with a shovel.
Wave-Slumbering Seabed Cave
This cave ruin is next to Pragma Island. The solution is only posted as moving images, so it could not be written out. The author advises grabbing the treasure map next to the artifact.
💡 Tip: Pick up the Propulsion Breathing Device first and the Karkano Island ruin becomes much easier.
⚠ Many posts show locations and sequences only in screenshots, so parts could not be confirmed in text. The Illiya Island chest reward is secondhand, and rewards for each ruin were not confirmed. The Satyros Island puzzle was left out because its answer is only an image.
Sources
Raon Community compiled this guide from official announcements and several guide sources (as of 2026-11-07). Rights to the game and videos belong to their developers and channels.
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