If you’ve spent any time poking around the icy western biomes of Subnautica: Below Zero, you’ve probably caught a distant glint of twisted metal half-buried in glacial ice or the ocean floor. That’s the mercury 2 wreck subnautica below zero, one of the most rewarding mid-game exploration spots for players looking to stock up on rare gear, unlock key story beats, and fill out their data bank entries. I first stumbled on it by accident while running from a stalker pack when I was 12 hours into my first playthrough, and I left with enough materials to upgrade my seatruck and finally build that spy penguin I’d been wanting for weeks. But it’s easy to get lost, freeze to death, or get ambushed if you don’t come prepared, so this guide walks you through every part of the site with no unnecessary spoilers.
Exact Location of the Mercury 2 Wreck in Subnautica Below Zero
You don’t have to wait until late game to reach the wreck, and you don’t need a prawn suit to get there either. The wreck sits between the Glacial Basin edge and the West Arctic Biome, at a depth of 120 to 180 meters, so a high-capacity oxygen tank is enough to keep you alive for the full trip if you don’t waste time wandering. If you’re navigating from your starting drop pod, head directly west until you spot the first large iceberg with a small cave entrance on its north face. The wreck is 70 meters directly below that iceberg, half-buried in the sandy ocean floor.
You’ll know you’re in the right spot when you see loose cargo crates floating around the exterior, and small groups of stalkers circling the broken cargo bay doors. Don’t follow the floating debris too far north, or you’ll drift into the leviathan patrolling zone. I made that mistake on my first visit, and I had to hide in a small ice cave for 10 minutes until the leviathan lost interest and swam away. Stick to the area within 50 meters of the iceberg, and you’ll be fine.
Essential Gear to Bring Before You Explore
You don’t need endgame gear to clear the whole wreck, but skipping a few key items will leave you stranded, frozen, or eaten before you can grab the best loot. From my 3 full playthroughs, these are the only items you absolutely need to pack:
- High-capacity O2 tank: You’ll spend 20 to 30 minutes navigating the tight corridors, so the standard tank won’t give you enough time to loot every room without returning to the surface repeatedly.
- Cold suit (at least level 1): Sections of the wreck are exposed to glacial wind, and you’ll have to cross small patches of ice between entrances. A level 1 cold suit gives you enough time to move between spots without stopping to warm up every 2 minutes.
- Repulsion cannon or stun rifle: Three shadow leviathans patrol the area directly above the wreck, and a small pack of stalkers hangs around the exterior cargo bays. Either weapon lets you escape a fight without taking critical damage.
- 2 spare batteries: Your flashlight, scanner, and weapon will run out of power faster than you expect in the dark, unpowered corridors of the wreck.
You can leave your prawn suit at home if you want, but it’s useful for carrying extra loot if you plan to clear every storage crate. I usually skip it, because the narrow hallways make it hard to maneuver, and I end up wasting time getting it stuck on broken bulkheads. If you do bring it, park it right outside the main cargo bay entrance so you don’t have to search for it when you’re ready to leave.
All Loot and Lore Content You Can Unlock
The wreck is split into 4 main sections: the cargo bay, crew quarters, command deck, and engine room. Most of the valuable content is in the first three sections, so you can skip the engine room entirely if you’re short on time. The most valuable reward in the wreck is the seatruck depth module MK2 blueprint, which lets you dive down to 300 meters, unlocking access to the Lost River and other late-game biomes. You’ll find it on a terminal in the command deck, right next to the captain’s quarters.
Other notable loot includes 6 spy penguin fragments, 3 ion battery fragments, and 4 large storage crates full of titanium, copper, and lithium. You’ll also find 3 med kits and 3 bottles of filtered water in the crew quarters, so you don’t have to pack extra survival supplies if you’re running low on inventory space. There’s a rare alien artifact tucked behind a broken desk in the far left corner of the captain’s quarters, which you need for one of the main Al-An story quests. I missed that locker on my first run, and I had to come back 10 hours later when I realized I was missing the required item to progress the story.
You’ll also find 7 data terminals scattered across the wreck that fill in key lore gaps about the Mercury 2’s mission. The entries explain why Alterra sent a second crew to 4546B after the events of the first Subnautica game, and what happened to the crew before the crash. It’s some of the most compelling story content in the whole game, so don’t skip scanning those terminals even if you’re just there for the loot.
Common Mistakes to Avoid During Your Visit
Even if you come with the right gear, it’s easy to make small mistakes that ruin your run. First, don’t visit the wreck at night if you’re playing on survival mode. The cold is 30% stronger after dark, and predators are far more active. I made that mistake on my second playthrough, and I had to abandon my run halfway through because my cold suit ran out of charge and a stalker bit through my O2 line. Go early in the in-game day, and you’ll have plenty of light and warmer temperatures to work with.
Don’t try to loot the engine room first either. The engine room has low-level radiation leaks, and you won’t get anything useful there besides a few spare copper wires. It’s a waste of O2 and time, and you can get radiation poisoning if you stay too long without a radiation suit. Stick to the cargo bay, crew quarters, and command deck, and you’ll get all the good stuff without the unnecessary risk.
Another common mistake is trying to squeeze through the broken airlock on the east side of the wreck. It’s blocked by a thick sheet of ice, and you’ll get stuck if you try to force your way through. Use the wide-open west side cargo bay entrance instead, it’s easy to spot and leads directly into the main section of the wreck. Finally, don’t leave without double-checking that you scanned all the data terminals. The lore you get here adds so much context to the rest of the game’s story, and it’s easy to miss one hidden behind a loose metal panel if you’re rushing.
At the end of the day, the mercury 2 wreck subnautica below zero is one of the most fun, rewarding exploration spots in the game, and it’s well worth a detour as soon as you get your first high-capacity O2 tank. You’ll walk away with gear that makes the rest of the game far easier, plus lore that makes the whole story feel more grounded and real. Just follow the tips in this guide, pack the right gear, and keep an eye out for predators, and you’ll have a smooth, successful run. If you find any hidden spots we missed, feel free to drop a note in the comments below.
