Subnautica 2 Tadpole Haul Chassis Fragment Locations

This article tells you exactly where to find the Tadpole Haul Chassis fragments in Subnautica 2, what they look like, and how to use them to build the Haul module for your Tadpole. The fragments are found in three distinct biomes, and you need to scan three of them to unlock the blueprint.

What the Haul Chassis Is and Why You Need It

The Haul Chassis is a vehicle upgrade module for the Tadpole, the small one-person submersible in Subnautica 2. Once installed, it increases the Tadpole’s storage capacity, letting you carry more resources, food, and equipment on long expeditions. It is one of the first practical upgrades you’ll want because the base Tadpole cargo hold fills up quickly when you’re collecting titanium, quartz, and copper.

The module is crafted at a Modification Station, which itself requires a Fabricator and a Habitat Builder. The blueprint becomes available only after you scan three Haul Chassis fragments. Without the blueprint, the Modification Station won’t show the recipe, so locating and scanning fragments is the critical first step.

Fragment Locations: The Three Biomes

Unlike some upgrades that appear in scattered wrecks, the Haul Chassis fragments are consistently found in three specific biomes. You can find them in the Kelp Forest, the Grassy Plateaus, and the Mushroom Forest. In each biome, the fragments appear as large, dark grey metal plates with a distinctive circular indentation and a few exposed wires. They are often half-buried in sand or wedged between rocks.

• Kelp Forest: Look near the base of the tall kelp stalks, especially in the sandy clearings between the dense plant growth. Check the edges of the biome where it transitions to the Grassy Plateaus.
• Grassy Plateaus: Search the red grass areas, particularly around the small rock arches and the bases of the larger sandstone outcrops. Fragments are often partially covered by the red grass, so scan slowly.
• Mushroom Forest: The largest fragments spawn here, often sitting on the flat tops of the giant mushroom trees or leaning against their trunks. Check the bases of the trees as well, as some fragments fall to the forest floor.

How to Find the Fragments Efficiently

Because the fragments are spread across three biomes, a systematic search is better than wandering. Start in the Kelp Forest, which is usually the closest to your starting lifepod. Swim in a grid pattern, moving from one side of the biome to the other, keeping an eye on the seafloor. The fragments are large enough to spot from a distance, but the kelp can obscure them, so stay low.

Once you’ve scanned one fragment, the game marks the biome on your map with a fragment icon. This is a huge help—it tells you that at least one more fragment is in that area. However, the icon does not show the exact location, so you still need to search. After clearing the Kelp Forest, move to the Grassy Plateaus, then the Mushroom Forest. In each biome, you only need one fragment, but finding two or three in a single biome can save you a trip.

Scanning and Unlocking the Blueprint

To scan a fragment, equip your Scanner and aim at the fragment until the scan completes. The scan takes about five seconds and requires you to stay within range. Once the scan is done, the fragment disappears and you get a progress notification. You need three scans total, but they don’t have to be from the same biome—any combination of three fragments from the three biomes will work.

After the third scan, you’ll receive a notification that the Haul Chassis blueprint has been added to your databank. Open your PDA to confirm. The blueprint is now available at the Modification Station. If you haven’t built a Modification Station yet, you’ll need to craft one at a Fabricator using a Computer Chip, a Wiring Kit, and a Titanium Ingot.

Crafting the Haul Chassis Module

Once you have the blueprint, go to a Modification Station and select the Haul Chassis. The recipe requires:

• 1x Titanium Ingot
• 1x Wiring Kit
• 1x Plasteel Ingot

The Plasteel Ingot is the most difficult material to get early on, as it requires a Fabricator with a modification that uses Lithium and Titanium. Lithium is found in the Mountain biome and the Deep Grand Reef, so you may need to make a side trip. Once you have the materials, the crafting takes about 15 seconds. The module is then placed in the Tadpole’s upgrade slot, which is located on the underside of the vehicle, near the rear thruster.

Using the Haul Chassis Effectively

After installing the Haul Chassis, your Tadpole’s cargo capacity increases from 4 slots to 10 slots. This is a significant boost, allowing you to carry a full set of tools, spare batteries, and a decent amount of mined resources. The module does not affect speed or maneuverability, so you won’t lose any performance.

One common mistake is to fill the extra slots with food and water. While that’s fine for short trips, it’s better to use the extra space for resources and keep a couple of cured fish and a bladderfish in your personal inventory. The Tadpole is still a small vehicle, so you’ll want to return to base regularly to drop off materials.

Common Problems and Misconceptions

A frequent issue players run into is not finding enough fragments because they only search one biome. The game’s fragment distribution is random, but each biome has a guaranteed minimum. If you’ve searched the entire Kelp Forest and only found one fragment, the other two are definitely in the other biomes. Don’t waste time re-searching the same area.

Another misconception is that the Haul Chassis fragments are the same as the Storage Module fragments. They are not. The Storage Module is a separate upgrade that adds a single large locker to the Tadpole’s exterior. The Haul Chassis is an internal cargo expansion. Both are useful, but they are crafted from different fragments found in different locations.

Frequently Asked Questions

Do I need to find all three fragments in one biome?

No. The three fragments can be from any combination of the three biomes. You just need to scan three total fragments to unlock the blueprint.

Can I find Haul Chassis fragments in wrecks?

No. Unlike some other upgrades, the Haul Chassis fragments only spawn in the open world in the three biomes listed above. They do not appear inside wrecks or in supply crates.

What if I scan a fragment but don’t get the blueprint?

You need exactly three scans. If you’ve scanned two and then die before scanning the third, your progress is saved. The third scan will unlock the blueprint. If you’ve scanned three and still don’t have it, check your databank under ‘Vehicles’—the blueprint may have been added but not highlighted.

Is the Haul Chassis worth the Plasteel Ingot?

Yes, especially if you plan to explore deeper biomes. The extra storage lets you carry more food, water, and spare batteries, which are essential for long dives. It’s one of the most cost-effective upgrades for the Tadpole.

Can I remove the Haul Chassis after installing it?

Yes. You can remove the module from the Tadpole’s upgrade slot at any time. The module is not consumed, so you can reinstall it later or move it to another Tadpole if you build a second one.

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