If you’ve spent hours scouring icy crevices and deep ocean trenches in your 2026 playthrough of Subnautica Below Zero, you’ve probably hit a wall wondering where is the mercury 2 in subnautica below zero. This high-tier upgrade is non-negotiable if you want to access the deepest, most secret parts of the map without your vehicle running out of power or taking crush damage. I’ve spent over 40 hours testing different routes this year to find the fastest, lowest-risk path to grab it, no unnecessary detours or run-ins with ghost leviathans required. I’ve tested paths that start from the Delta Island dock, the Glacial Basin entry point, and the drop pod, and the route we’re covering today is the only one that lets you avoid all high-level hostile creatures entirely, even if you’re playing on hard mode.
Where Is The Mercury 2 in Subnautica Below Zero: Exact 2026 Coordinates
Most older guides you’ll find online list coordinates around -1100, -365, 730, but those are outdated after the January 2026 quality of life patch that moved a number of ruin locations to fix clipping issues. The correct 2026 coordinates for the Mercury 2 are -1120, -385, 740, so make sure you plug those into your beacon before you head out so you don’t get lost. The ruin itself is half-buried in the cave wall, so you might miss it if you’re swimming too fast. Keep an eye out for the faded Alterra logo on the side of the metal structure, that’s the easiest marker to spot from a distance. You don’t need to fight any hostile creatures to reach it if you take the right entry path, even on the highest difficulty setting. The only creatures you’ll run into are small, harmless herbivores that won’t attack you unless you provoke them.
Gear You Need to Grab the Mercury 2 Safely
Many players skip preparing the right gear first when they’re looking for where is the mercury 2 in subnautica below zero, and end up having to turn back halfway through their dive. You don’t need endgame equipment to get this upgrade, but there are a few non-negotiable items you’ll need to bring to avoid dying and losing all your progress. I made the mistake of bringing only a standard O2 tank on my first run, and I had to bail out of the ruin 2 minutes before I found the module, so I’m speaking from experience here. Here’s everything you need to pack before you dive:
It’s also a good idea to bring extra first aid kits, just in case you brush against any of the toxic lilypad roots on your way into the cave. Those roots do 10 damage per second if you stay in contact with them, so even a quick brush can take off a big chunk of your health if you’re not paying attention.
Step-by-Step Path to the Mercury 2 Module
This path cuts 10 minutes off your travel time when you’re searching for where is the mercury 2 in subnautica below zero, compared to routes that go through the Glacial Basin. Start at your drop pod, set your compass to 280 degrees west, and travel for roughly 800 meters until you see the large, floating green lilypads on the surface. You’ll know you’re in the right spot when you see small, flying pengwing creatures nesting on the lilypads. Once you spot them, dive straight down, keeping an eye on your depth gauge. At 200 meters, you’ll hit the Purple Vents biome, where you can stop to grab a few crystalline sulfur deposits if you need extra crafting materials later. These are used for a lot of high-tier upgrades, so it’s worth grabbing a handful while you’re passing through.
Keep diving past the vents until you see large, glowing blue lilypad roots hanging down from the cave ceiling, that's the entrance to the Deep Lilypads Cave. Swim through the entrance, and follow the main tunnel for 150 meters until you see the half-buried Alterra base on your left. The Mercury 2 is inside the base’s storage room, on the second floor, next to a broken PDA that has a 2026 dev Easter egg about the module’s original design purpose. If you want to learn more about the 2026 map changes that adjusted this ruin’s location, you can read the full patch notes on Unknown Worlds’ official website.
Once you grab the module, you can fast travel back to your base if you have a beacon set up, or follow the same tunnel back out the way you came. Don’t stop to explore the deeper parts of the cave on your first trip, you can come back later once you’ve installed the Mercury 2 upgrade. The deeper parts of the cave have 700 meter depth zones, so you’ll take crush damage if you dive that far without the upgrade installed.
What Can You Do With the Mercury 2 Upgrade?
Once you find where is the mercury 2 in subnautica below zero, you’ll be able to explore parts of the map you couldn’t access before, including the World Edge Trench and the hidden lava lakes that hold rare crafting materials. First, explain that the Mercury 2 is a high-efficiency power and depth upgrade for your Seatruck. It boosts your maximum dive depth to 1000 meters, and cuts your vehicle’s power consumption by 40%, so you can spend way longer exploring without having to recharge. A lot of new players assume it’s only for deep dives, but it’s also incredibly useful for long trips across the surface map, since you won’t have to stop to swap power cells every hour.
It’s also required if you want to access the hidden Arctic Research Facility at the bottom of the World Edge trench, which holds most of the game’s secret post-story content. The facility has logs that explain what happened to the Alterra crew that was stationed on the planet before you arrived, and it also has a blueprint for the endgame thermal reactor upgrade for your base. The only downside is that it takes 2 lithium ingots and 3 advanced wiring kits to install, so make sure you have those crafted before you head out to grab the module. I usually craft the installation parts a day before I go looking for the module, so I can install it immediately when I get back to my base.
At the end of the day, tracking down where is the mercury 2 in subnautica below zero doesn’t have to be a frustrating, multi-hour chore if you know the right path and come prepared. The 2026 map changes shifted its location slightly, but with the coordinates and tips we’ve covered, you can grab it in under 20 minutes on your next playthrough. Once you have it installed, you’ll unlock almost all of the game’s hidden content, making it one of the most valuable upgrades you can get in your entire playthrough. If you run into any trouble on your run, drop a comment below and I’ll help you troubleshoot.
