The one free blue tablet in Subnautica is located on a pedestal inside the Alien Thermal Plant, deep within the Lava Lakes biome. To reach it, you must travel through the Lost River and descend into the Lava Lakes, where the plant harnesses geothermal energy.
The one free blue tablet subnautica location
The only naturally-spawning blue tablet sits on a pedestal in a specific room of the Alien Thermal Plant. This facility is found in the Lava Lakes biome, which you access by descending through the Lost River. Once inside the plant, navigate to the main control room; the blue tablet is clearly displayed on a pedestal, ready for pickup. No scanning or hidden compartments are involved, it is in plain sight. Be cautious of the Lava Larvae and other hostile creatures in the surrounding biome, but the tablet itself is unguarded.
How to craft a second blue tablet
Only one blue tablet spawns naturally in the game world. If you need an additional tablet, for example, to unlock the Primary Containment Facility without returning to the Thermal Plant, you must craft it. The verified crafting recipe requires one Ion Cube and two Kyanite. You can fabricate the tablet at any Fabricator once you have these materials. Ion Cubes are found in various alien structures, while Kyanite is mined from large deposits in the Lava Zones.
What the blue tablet unlocks
The blue tablet is the key to the Primary Containment Facility, also known as the Alien Sanctuary. This facility is the final major story location in Subnautica, where you encounter the Sea Emperor Leviathan and complete the game's narrative. Without the blue tablet, the forcefield blocking the entrance to the Primary Containment Facility cannot be deactivated. This makes the tablet essential for progressing past the endgame, much like how the orange tablet subnautica unlocks a critical precursor cache earlier in the story.
