If you’ve spent dozens of hours cruising Subnautica’s alien oceans, looting wrecks and avoiding leviathans, you’ve probably heard whispers of the hidden Mercury 2 outpost. It’s one of the most rewarding unmarked locations in the game, packed with rare crafting materials, lore logs, and a safe base spot far from most aggressive creatures. Figuring out how to get to Mercury 2 Subnautica isn’t spelled out anywhere in the game’s story, so I put together this guide after 3 separate failed attempts to find it on my own.
Prerequisites Before You Learn How to Get to Mercury 2 Subnautica
You can’t head to Mercury 2 in the early game, no matter how good your navigation skills are. The outpost sits far below the safe depth of unupgraded vehicles, and the surrounding biomes have hazards that will take out an unprepared player in seconds. I recommend waiting until you’ve explored the Aurora and unlocked mid-tier crafting recipes before making the trip, to avoid wasting time on a failed run.
The exact gear you’ll need to bring includes:
I made the mistake of heading down on my first try with only a MK2 depth module, and I had to turn back 100 meters short when my Seamoth started crumbling. Don’t waste that trip—double check your gear before you leave base, and test your Seamoth’s depth limit in a less remote area first if you’re unsure.
Step-by-Step Route to Mercury 2
First, orient yourself from Lifepod 5 so you’re facing the direction of the Aurora’s front end, which points toward the northeastern part of the map. You’ll first head through the Grassy Plateaus biome for about 800 meters, keeping an eye out for red grass and occasional reefback leviathans. These are passive, so you don’t need to worry about them attacking as long as you don’t get too close to their sides where the symbiotic crabs live. If you start seeing stalkers, you’ve drifted too far west, so adjust your course to the right a bit.
Once you pass the Grassy Plateaus, you’ll drop into the Grand Deep biome. You’ll know you’re in the right spot when you start seeing glowing blue mushroom trees and the water gets significantly darker. Stick to the western edge of this biome as you keep descending, because the eastern edge borders the void where ghost leviathans spawn constantly. You’ll pass a few small, half-buried wrecks on your way down—those are good checkpoints to confirm you’re on the right path.
Keep descending until you hit the 700 meter mark, and start scanning the rock walls to your left. The Mercury 2 entrance is a small, unmarked metal hatch embedded in the rock, partially covered by glowing coral. It’s easy to miss if you’re going too fast, so slow your Seamoth down to half speed once you pass 650 meters. If you pass a large wreck with broken solar panels on its roof, you’ve gone 200 meters too far east—turn back and follow the rock wall again until you spot the hatch.
Common Mistakes to Avoid When Looking for Mercury 2
A lot of players skip bringing beacons because they assume they’ll remember the route, but the deep biomes all look almost identical once you’re below 500 meters. I lost 2 hours of progress on my second attempt because I wandered off course and couldn’t find my way back to a shallow enough area to recharge my Seamoth. Drop a beacon every 200 meters if you’re prone to getting lost, it’s worth the extra inventory space.
Another common mistake is underestimating leviathan spawns in the Grand Deep. The biome has far fewer aggressive creatures than the Lost River, but there are still 2-3 ghost leviathans that patrol the border between the Grand Deep and the void. If you see a large, glowing white shape moving toward you, activate your perimeter defense immediately and turn away from the void edge. Don’t stop to try to scan it—they can take out half your Seamoth’s health in one hit if you’re not paying attention.
Plenty of players also think they can get away with a regular O2 tank if they’re fast, but you’ll burn through O2 twice as fast at 700 meters without a rebreather. I’ve had to rush back to my Seamoth mid-loot more than once because I forgot to equip mine before heading down. It’s a tiny piece of gear that makes a massive difference, so don’t leave home without it.
What to Do Once You Reach Mercury 2
Once you pry open the entrance hatch, you’ll find a small, fully pressurized interior with 3 separate rooms that are completely safe from outside creatures. The first room has a working fabricator and a storage locker with 4 rare ion crystals, which are almost impossible to find anywhere else outside the late-game lava zones. Grab those first, because they’re the best reward for making the trip, and you can use them to build late-game tools like the ion power cell.
The second room has 7 lore logs that explain what happened to the Mercury 2 crew before the Aurora crashed. They add a ton of context to the game’s overall story, including details about the Alterra corporation’s secret research on the planet’s Kharaa bacterium. Make sure you scan all of them to unlock the full backstory, there’s even a hidden achievement for collecting all Mercury 2 logs. There’s also a working water filtration machine in this room that you can take if you want to add it to your own base, no crafting required.
The third room is an empty habitat module with a pre-built bulkhead and power source. You can claim this as your own deep-water base for free, no building required. It’s the perfect spot to stage future trips to the Lost River or lava zones, because it’s far safer than building your own base in those biomes, and it already has access to power. I keep a storage locker there with spare gear for deep runs, and it’s saved me from multiple trips back to my main base on the surface.
Mercury 2 is one of Subnautica’s best hidden secrets, and it’s well worth the trip if you’re looking for rare materials, extra lore, or a free deep-water base. Take the time to gather the right gear and follow the route we laid out, and you’ll have a far easier time than I did on my first few attempts. Now that you know how to get to Mercury 2 Subnautica, grab your Seamoth and head out—just don’t forget those beacons.
