Subnautica 2 Hot Zone Surface: All Hidden Items and Blueprints

The Hot Zone Surface — the shallow graveyard above the Hot Caves — is where Subnautica 2 hides two of your body upgrades, a stack of base blueprints, five audio logs, and the Scout Ray Chassis. Everything is tucked into wrecks, a secret lab, and the Tadpole Pens, so it is easy to leave half of it behind if you just skim the surface on your way to the caves. This route walks each stop in order and flags the blueprints you can safely skip if you already own them.

Access and survival prep before the route

The Hot Zone runs hot enough to cook you. Your biology caps out around 80°C by default, but the surface here pushes past 100°C, so you need the Heat Tolerance Adaptation before you commit. You earn it by building the Sonic Resonator, destroying the three Bloom Cankers, then interacting with the Angel Comb in the opened Bloom Core. Even with tolerance, swimming right into the thermal vents still chips your health, so keep a little distance.

Bring a Tadpole for oxygen — the Tadpole Pens are a long sweep with no air pocket — and pack flares for the dark caves. A patrolling Marrowbreach haunts Tailings Village; it is more nuisance than threat, but flares help you keep track of it. A Leviathan hunts the trench edge near the story building and the Easter egg, so mind how close you drift to the drop-off.

Hot Zone Surface route checklist

Reaching Tailings Village and the broken coral loot

From the lifepod you follow one compass line to the village, scooping up the coral-cluster blueprints and the village decor on the way.

Head toward Tailings Village

From the lifepod, cruise to a compass heading between 105 and 120.

Stop at the broken coral

Look for the coral cluster short of the village; it holds a few blueprint boxes plus a supply box with salt and copper wire.

Grab the Roof Antenna box

This is external base decor — the roof antennas for the top of your base.

Take the Moonpool data card

It sits in a little building nearby; it is a duplicate, so skip it if you already own the Moonpool.

Scan the village decor

Work the buildings for the jars, rug, alien hanging baskets, and the tailings table off to the side of each room.

Pick up the Half Round Room blueprint

Inside the jar building; it is the big glass observatory room and the closest thing here to the old glass dome.

Finding the Roof Cylinder in the northwest cave

1. INTRO: A short detour northwest from the village clears the rest of your roof decor set.
2. Head northwest to the large cave — It sits to the north under the giant lava vent and magma plume.
3. Reach the central mushroom — Drive to the large mushroom at the center of the cave.
4. Grab the Roof Cylinder and Roof Panel — These finish off your roof decorations; the Roof Pump is not here — that one is down in the Hot Caves.

Getting into Nahheima’s hidden Hot Zone lab

1. INTRO: This southern detour hides the extra quick slot, so it is worth the trip to the edge of the biome.
2. Detour south toward bearing 255 — Head to the southern edge of the Hot Zone near the southern entrance to the Hot Caves.
3. Find the holes and the dead crab — Look for the holes in the ground and the dead crab with the black box — the same landmark tied to Zip’s access ID.
4. Turn north-northeast into the cave — Face between 15 and 30 and cruise into the oddly shaped cave; this is Nahheima’s secret laboratory.
5. Grab the Nook blueprint — The little reading-nook piece that pops out of the side of your base.
6. Collect the It’s All Go To Die audio log — While inside, also grab the power cell and power battery base blueprints.
7. Scan the Bio Bed quick-slot upgrade — This Bio Bed gives you an extra quick slot, bringing you up to seven.

Clearing the central wreck and its supply caches

1. INTRO: The tallest lava plume in the biome marks the big wreck; the northern side hole is your way in.
2. Grab the northeast supply cache — Head north-northeast to the lava plumes on the edge of the zone for a crate with a couple of sulfur.
3. Enter the wreck’s northern side hole — The big wreckage sits under the tallest lava plume; the side hole is the easiest way in.
4. Collect the Bio Bed body upgrade — Inside you get a second character upgrade from the Bio Bed, plus a blueprint.
5. Grab the Play God audio log — Scan the wall extras too, like the power cell charging terminal.
6. Take the Half Round Room data box — It sits on the floor by the half-open door to your left — a duplicate Half Round Room copy.
7. Sweep the nearby supply stop — Pick up the nutrient block, power storage, battery, and copper wire from the crates just outside.

Sweeping the Tadpole Pens and the locked story room

1. INTRO: The Pens are the densest stop, with the Scout Ray Chassis, another audio log, and the one-of-a-kind Axom wall lamp behind a locked door.
2. Enter the main Tadpole Pens building — Bring your Tadpole for oxygen and take your time scanning the stools, chairs, and dining tables.
3. Grab the Survivors Waypoint 2 audio log — It is off to the left as you come in.
4. Take the Moonpool recipe — Another duplicate, in the main room to your right.
5. Scan the Scout Ray Chassis — You only need to scan one to unlock the chassis that makes you slightly faster; grab the garbage can while you are here.
6. Open the locked story room — This door needs the keycode you get from the Hot Caves where Zip is.
7. Scan the Axom wall lamp — This is the only Axom wall lamp in the game and the only place to get it, so do not skip it; a repair tool fragment and a poster are in here too.
8. Handle the story Bio Bed and Noah — Talk to Noah and the Bio Bed to move the story, and keep off the edge where the Leviathan lurks.

Looting the two broken Tadpole Pens structures

1. INTRO: Two wrecked chunks finish the biome, and they hold the internal wall decor set plus the last two audio logs.
2. Hit the southern broken base chunk — Scan the spotlights outside before you enter through one of its openings.
3. Grab the Small Crate data box — This recipe unlocks all of the internal wall decor — wall unit, wall panel, wall unit large, wall vent, and wall vent large.
4. Collect the Tadpole Ops Guide audio log — Scan the processor here if you still need it.
5. Move to the southern broken building — Scan a couple of the hydroelectric turbines scattered nearby to finish that power source.
6. Take the last Moonpool recipe — It sits inside alongside a few more scannables.
7. Grab the We Must Voluntarily Die audio log — The final Nahheima log closes out the sweep.

Video help

Googly-eyed clam Easter egg along the trench

Once the collectibles are done, there is one optional sight for the curious. Follow the edge of the trench between the big spire and the dead crab, then drop down the rock face and dip past the barrier wall that warns you off. Somewhere along that slope is the googly-eyed clam — a tiny, cute miniature of the great jaw.

It is purely cosmetic and genuinely dangerous: the Shiver Leviathan patrols this stretch and will happily eat you. Leave your Tadpole behind so you do not lose it, and if you only want the sight, do the trip in creative mode. In survival, treat it as skippable.

Guides you’ll want next

If you are still locked out of the biome, start with the Heat Tolerance Adaptation and the Angel Comb route. The locked Tadpole Pens room ties back to the Hot Caves and finding Zip for the base access ID, so that run pairs naturally with this one. And since the two Bio Beds here are only part of the set, the full Bio Bed / inventory upgrade route across the map is the logical follow-up once you have banked these.