Mastering the Depth Module Upgrade for Your Tadpole in Subnautica 2

Exploring the depths of Subnautica 2 is thrilling, but your trusty tadpole submarine has limits. One of the first major upgrades you'll want to secure is the depth module, which pushes your vehicle's pressure tolerance further so you can venture deeper without constantly worrying about crush depth or finding oxygen pockets. This guide answers all your burning questions about finding, crafting, and installing the tadpole depth module.

1. What exactly is the tadpole depth module and why do I need it?

The tadpole depth module is a special upgrade that increases your submarine's maximum operating depth. Without it, your tadpole will start taking damage past its default limit—usually around 200 meters. After installing the module, you can safely descend to deeper biomes, gather rare resources, and avoid the frequent trips back to the surface. In essence, it's your ticket to the mid-game and beyond. You'll notice a significant improvement in your exploration range because you won't have to constantly check your depth gauge or worry about sudden implosions. The module itself fits into one of the tadpole's upgrade slots, which are located on the vehicle's hull.

Mastering the Depth Module Upgrade for Your Tadpole in Subnautica 2 — Source: www.polygon.com

2. Where can I find the depth module blueprint or fragments?

Depth module fragments are scattered throughout the early to mid-game areas, but they can be easy to miss if you're not scanning thoroughly. Commonly spawn locations include the kelp forests, grassy plateaus, and the edges of the safe shallows (though the latter rarely contains fragments). You'll recognize them as small, damaged pieces of advanced technology that glint in the light. Use your scanner tool to analyze them; you need three fragments to unlock the blueprint. Keep an eye on your PDA for scan completions. Alternatively, some wrecks or databoxes near deeper biomes might contain the full blueprint, but those are riskier to reach without an upgrade. Pro tip: craft a scanner room near the kelp forest and set it to scan for "technology" to locate nearby fragments faster.

3. What materials do I need to craft the depth module?

Once you have the blueprint, gather the following items: 1 Plasteel Ingot, 1 Advanced Wiring Kit, and 1 Enameled Glass. Plasteel is made from two titanium and one lithium in a Fabricator. For the Advanced Wiring Kit, you'll need a standard Wiring Kit (copper and silver) plus one additional gold and one computer chip. Enameled Glass requires two pieces of glass (made from quartz) and one stalker tooth. You'll also need a modification station to craft the module itself, which you can build using the Habitat Builder. The station requires a standard computer chip, titanium, and copper. So overall, be prepared to do some grinding in biomes that yield lithium, gold, and stalker teeth (the kelp forest is excellent for the latter).

4. How do I actually craft and install the depth module on my tadpole?

First, ensure you have a modification station built inside your base or Cyclops. Approach the station and open its crafting menu—look for the Vehicle Upgrades category. Select the tadpole depth module and craft it using the materials listed. Once you have the module in your inventory, swim up to your tadpole and locate the upgrade slots (there are usually two on the sides near the docking hatch). Interact with the slot and choose to install the module. The submarine will immediately receive a depth boost, often displayed as a new crush depth value in the vehicle's HUD. You can also remove or swap modules later, so feel free to experiment with other upgrades like the sonar or thermal reactor.

5. Any tips for getting the depth module earlier or more safely?

Absolutely. One strategy is to rush the Scanner Room in your first base, then build a range upgrade to locate fragments quickly without wandering into dangerous zones. Another tip: always carry a Laser Cutter when exploring wrecks, as some fragments are behind sealed doors. If you're struggling to find lithium, check the mountain island caves or the deeper parts of the mushroom forests (but be wary of predators). Also note that you can exploit the tadpole's default crush depth by staying just above it—once you have the module blueprint, gathering the materials for Plasteel and Enameled Glass will be your biggest bottleneck. Consider building a small outpost near a rich resource area to cut down travel time. And finally, don't forget to scan everything you see; even common wreckage can yield unexpected blueprints.

6. Are there alternative ways to increase depth resistance without the module?

In early game, you can temporarily increase your tadpole's survivability by equipping the Hull Reinforcement upgrade, which reduces damage taken from impacts but does not raise the actual crush depth. Another workaround is to pilot a Prawn Suit if you've found one, as it has a natural depth limit comparable to an upgraded tadpole. However, the tadpole depth module remains the most efficient solution because it directly increases your sub's pressure tolerance without sacrificing speed or maneuverability. There is no other upgrade that grants a flat depth bonus—so ultimately, investing in the module is non-negotiable for serious deep-sea exploration.

7. Frequently asked questions about tadpole depth modules

Q: Can I stack multiple depth modules on one tadpole? No, the game only allows one depth module per slot type. You can, however, combine it with a Depth Module MK2 if you find its blueprint later, which replaces the MK1 module with a higher tier.
Q: Does the depth module affect my oxygen usage? No, oxygen is separate; you still need to rely on the tadpole's oxygen supply or use a rebreather.
Q: What if I lose my tadpole with the module installed? The module will be lost along with the vehicle unless you retrieve it from the wreckage. Always save before risky dives.
Q: How deep can I go with the MK1 module? Typically, it doubles your default depth from ~200m to ~400m. Exact numbers vary by game update, so check your PDA's vehicle stats after installation.