Blue Tablet Location in Subnautica
The Blue Tablet is found in the Lost River, specifically inside the large skeleton of the Gargantuan Leviathan Fossil, in the Bone Fields area. You need a Laser Cutter to open the supply crate that contains it, and you must have already crafted a Depth Module MK1 for your Seamoth or a Prawn Suit with a Depth Module to reach that depth safely.
Why You Need the Blue Tablet
The Blue Tablet is a key item that unlocks the Alien Thermal Plant, a facility built inside the inactive lava zone. Without it, you cannot progress past a certain point in the main story. The tablet itself is a small, translucent blue device with a glowing core. It is used once at a specific terminal and is consumed in the process, so you cannot reuse it. If you lose it or leave it behind, you will need to return to the same location to find another one, as only one spawns per game.
Exact Location and Route
To find the Blue Tablet, follow these steps:
- Start from your Lifepod and head toward the Aurora, then turn southwest to find the Blood Kelp Trench or the Grand Reef entrance to the Lost River.
- Descend through the Lost River corridor until you reach the Bone Fields, a large open cave with many rib-like fossils and green brine pools.
- Look for the enormous Gargantuan Leviathan Fossil skull, which is the largest skeleton in the game. The skull is on the western side of the Bone Fields, near the entrance to the corridor leading to the Inactive Lava Zone.
- Inside the skull’s mouth, you will find a supply crate on the floor. Use the Laser Cutter to open it. The Blue Tablet is inside.
The exact coordinates are roughly -800, -700, -900, but the skull is hard to miss once you are in the Bone Fields. If you see a giant ribcage, you are in the right area.
Required Equipment and Depth
The Blue Tablet is located at a depth of about 900 meters. The Seamoth cannot go below 900 meters even with the MK3 depth module, so you have two options:
- Use a Prawn Suit with a Depth Module MK1 (max depth 1300m) and a Drill Arm to collect any resources you need on the way.
- Use a Seamoth with Depth Module MK3 and be extremely careful, as you will be at the absolute limit of its depth rating. Any damage could cause it to flood.
You also need a Laser Cutter, which requires a Battery, a Diamond, and a Titanium. The Bone Fields are home to several hostile creatures, including Ghost Leviathans, so bringing a Stasis Rifle or a Repulsion Cannon is wise. A Seaglide is useful for the final approach, but the Prawn Suit is the safest option.
Common Mistakes and Misconceptions
A frequent mistake is assuming the Blue Tablet is in the Lost River’s main junction or near the Disease Research Facility. It is not. The tablet is only in the Bone Fields, inside the large skull. Another common error is bringing a Seamoth without a depth module and being crushed before reaching the location. Always check your depth module before descending. Some players also confuse the Blue Tablet with the Orange Tablet, which is found in the Deep Grand Reef Degasi Seabase and is used for a different door. The Blue Tablet is only for the Alien Thermal Plant.
What to Do After Getting the Blue Tablet
Once you have the Blue Tablet, head to the Inactive Lava Zone. The entrance is in the Lost River, near the Bone Fields, through a large cave opening. You will eventually reach a large alien structure with a glowing blue forcefield. Insert the tablet into the terminal next to the door. The door will open, allowing you to enter the Alien Thermal Plant. Inside, you will find the Ion Cube and the blueprints for the Ion Battery and the Ion Power Cell, which are essential for the endgame. The tablet is consumed, so do not expect to retrieve it.
Alternatives and Backup Plans
If you cannot find the Blue Tablet, double-check that you have explored the entire skull interior. Sometimes the crate is hidden behind a rib bone. If you have already used the tablet and need another one for a second playthrough, you will have to start a new game, as only one spawns. There is no alternative item that can replace the Blue Tablet. If you are playing in Creative Mode, you can craft a Blue Tablet at the Fabricator, but in Survival or Freedom mode, you must find it in the world.
Frequently Asked Questions
Can I get the Blue Tablet without a Prawn Suit?
Yes, but it is risky. A Seamoth with the MK3 depth module can reach the Bone Fields, but you will be at 900 meters, the exact limit of its depth rating. Any damage will cause immediate flooding. If you are careful and avoid Ghost Leviathans, it is possible, but the Prawn Suit is strongly recommended.
What if I lose the Blue Tablet?
If you drop it or die while carrying it, it will remain in the world where you dropped it, or in your last death location if you died. You can return to that spot to pick it up. If it somehow glitches out of the world, you may need to reload a save, as there is only one tablet per game.
Is the Blue Tablet used anywhere else?
No, the Blue Tablet is only used at the Alien Thermal Plant. The Orange Tablet is used at the Disease Research Facility, and the Purple Tablet is used at the Quarantine Enforcement Platform. Do not confuse them.
Do I need the Blue Tablet to beat the game?
Yes, it is a required item for the main story. Without it, you cannot access the Alien Thermal Plant, which is necessary to craft the Ion Batteries and Power Cells needed to power the Neptune Escape Rocket.
Can I find the Blue Tablet in the Inactive Lava Zone?
No, the Blue Tablet is not in the Inactive Lava Zone. It is in the Lost River, inside the Gargantuan Leviathan Fossil skull in the Bone Fields. The Alien Thermal Plant is in the Inactive Lava Zone, but the tablet is not.
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