Subnautica 2 Tadpole & Half Round Room Blueprints

To get the Tadpole and Half Round Room blueprints in Subnautica 2, you must scan their fragments in the Twisty Bridges and Deep Twisty Bridges biomes, primarily inside supply crates and wreckage. The Tadpole is a small, fast one-person submarine, while the Half Round Room is a multipurpose room variant that connects to the standard Multipurpose Room.

What Are the Tadpole and Half Round Room?

The Tadpole is a compact submersible introduced in Subnautica 2 (the sequel to Subnautica: Below Zero). It seats one person, has a small storage compartment, and is faster and more maneuverable than the Seatruck. It is ideal for exploring tight cave systems and the Twisty Bridges.

The Half Round Room is a base-building module that provides a curved, domed room. It attaches to the standard Multipurpose Room via a hatch, giving you extra space for lockers, fabricators, or decorative items without needing a full second room.

Where to Find the Tadpole Blueprint

The Tadpole fragments are found in the Twisty Bridges and Deep Twisty Bridges biomes. You need to scan three fragments to unlock the blueprint.

• Supply crates: Many fragments are inside sealed supply crates scattered across the seafloor. Use the propulsion cannon to open them.
• Wreckage: Look inside the larger wrecked structures, especially the ones with accessible interiors. Fragments are often near consoles or in corners.
• Under overhangs: Check beneath rock arches and ledges; fragments can be hidden in shadowy spots.

A reliable route is to start from the Drop Pod, head toward the Twisty Bridges (northeast), and sweep the area systematically. The Deep Twisty Bridges, reachable through the large tunnel in the Twisty Bridges, also contain multiple fragments. Bring a repair tool and a laser cutter to access sealed compartments.

Where to Find the Half Round Room Blueprint

The Half Round Room fragments are also in the Twisty Bridges and Deep Twisty Bridges, but they are more commonly found in wreckage interiors and large supply crates.

• Wrecked research stations: These have multiple rooms; check every compartment.
• Deep Twisty Bridges: The deeper sections have more fragments, but also more hostile fauna like the Squidshark.
• Scanning room: Build a Scanner Room in the area to highlight fragments within a 300-meter radius.

You need to scan two fragments to unlock the Half Round Room. It is a common find while searching for the Tadpole, so you will likely get both blueprints in the same expedition.

How to Scan Fragments

Scanning is done with the Hand Scanner, which you have from the start. Approach a fragment and hold the scan button until the progress bar completes. Each fragment type must be scanned the required number of times (three for Tadpole, two for Half Round Room). The blueprint is added to your databank automatically once you reach the required count.

Fragments are usually glowing blue or white and have a distinct shape. The Tadpole fragment is a chunk of the hull with a propeller; the Half Round Room fragment is a curved panel with a window.

Tips for Efficient Fragment Hunting

• Bring a Seaglide to cover more ground quickly.
• Use Beacons to mark locations where you found fragments, so you can return if you need more.
• Check the Scanner Room upgrade that shows fragments on the HUD (requires a HUD chip).
• Be aware of oxygen levels; the Deep Twisty Bridges are deeper, so a high-capacity tank or a vehicle with oxygen is helpful.
• If you are playing in Survival mode, watch your food and water; bring cured fish and filtered water.

Common Problems and Misconceptions

A common mistake is searching only the surface Twisty Bridges and missing the fragments in the deep sections. The Deep Twisty Bridges have a different layout and more wrecks. Another misconception is that the Half Round Room requires the same number of fragments as the Tadpole; it does not—only two are needed.

Some players report that fragments do not appear until after a certain story event. In Subnautica 2, fragment spawns are fixed, not story-gated, so you can find them early. If you are having trouble, double-check that you are in the correct biome; the Twisty Bridges are distinct from the Arctic Kelp Caves.

Using the Blueprints

Once unlocked, the Tadpole can be built at a Vehicle Bay (the mobile platform). It requires titanium, lead, and quartz. The Half Round Room is built with the Habitat Builder; it costs titanium and quartz. The Half Round Room attaches to a Multipurpose Room’s hatch; you cannot place it directly on a corridor.

The Tadpole is excellent for exploring the Twisty Bridges because it is small enough to navigate tight spaces. It has a built-in storage locker and can be upgraded with a storage module later. The Half Round Room gives you a nice curved space for a bed or a desk, and it can be stacked with other rooms.

Frequently Asked Questions

Do I need the laser cutter to get the Tadpole fragments?

Sometimes. Some wrecks have sealed doors that require a laser cutter. If you do not have one, you can still find enough fragments in open areas and supply crates, but the laser cutter increases your chances.

Can I find Tadpole fragments in the Arctic Kelp Caves?

No, the Tadpole fragments are exclusive to the Twisty Bridges and Deep Twisty Bridges. The Arctic Kelp Caves contain other blueprints, like the Seatruck modules.

How many fragments do I need for the Half Round Room?

You need to scan two Half Round Room fragments. The blueprint will unlock immediately after the second scan.

Is the Tadpole better than the Seatruck?

The Tadpole is faster and more agile, but the Seatruck can be expanded with modules and has more storage. Use the Tadpole for scouting and the Seatruck for long expeditions.

Can I build the Half Round Room without a Multipurpose Room?

No, the Half Round Room requires a standard Multipurpose Room to attach to. It is an extension, not a standalone room.

What if I scan more than required fragments?

Extra fragments are simply wasted; scanning more than the required number does not give any bonus. You can ignore them after the blueprint is unlocked.

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