Subnautica 2 Depth Module Guide: Mk.1, Mk.2 & 450m
Subnautica 2 Depth Module guide: Mk.1 location, 450m limit, Celestine and Enameled Glass materials, Mk.2 800m status, and Tadpole upgrade order.
Last updated: 2026-07-01
What is the Subnautica 2 Depth Module?
The Depth Module is the Tadpole upgrade that raises your safe diving limit. A base Tadpole is safe to about 250m; Depth Module Mk.1 raises that to 450m, which is the key threshold for Karakorum, Metal Farms, and most mid-game resource routes.
Priority: craft Depth Module Mk.1 before chasing comfort upgrades. Without it, Alien Ruins follow-up objectives and deep materials become slow, risky, or blocked.
Mk.1 vs Mk.2
| Configuration | Safe depth | Current recommendation |
|---|---|---|
| Base Tadpole | 250m | Enough for the Tadpole Pens door, not for deeper black-box and Karakorum routes. |
| Depth Module Mk.1 | 450m | Your main Survival progression target after reaching Alien Ruins. |
| Depth Module Mk.2 | 800m | Tracked in site data as late/Creative-only for now; do not plan normal Survival progression around it. |
Depth Module Mk.1 Location
After reaching Alien Ruins, follow the Ruby second black-box route toward the Needler Nest cave. Public guide coverage places the Tadpole Depth Module Mk.1 near Ruby's black box / Needler Nest southeast of the Alien Ruins Research Base. Once you have the blueprint, craft it at the Modification Station.
Mk.1 Recipe
| Ingredient | Amount | Tip |
|---|---|---|
| Celestine | x3 | Found in Karakorum. Hand-mining is more efficient than Sonic Resonator here. |
| Enameled Glass | x2 | Requires Creature Enamel, which is a mineral deposit, not a creature drop. |
| System Chip | x1 | Bring electronics materials before you settle into the deep region. |
Recommended Route
- Finish Tadpole Pens and cross into Alien Ruins.
- Build a small local base and a Modification Station near Alien Ruins.
- Find the Mk.1 blueprint near Ruby's second black box / Needler Nest.
- Collect Celestine and Creature Enamel in the same run.
- Return to base, craft Mk.1, and install it in the Tadpole upgrade slot.
FAQ
Q: How do I get the Subnautica 2 depth module?
A: Reach Alien Ruins, find the Mk.1 blueprint around Ruby's second black box / Needler Nest, then craft it at the Modification Station.
Q: How deep does Depth Module Mk.1 go?
A: It raises the Tadpole's safe depth to about 450m.
Q: Can I get Mk.2 in normal Survival?
A: The site tracks Mk.2 as an 800m late/Creative-status upgrade for now. For normal Survival progression, plan around Mk.1 first.
Q: Can I reach Tadpole Pens without a depth module?
A: You can reach the door, but Zip's black-box route goes below the base Tadpole's 250m limit. Park safely and swim the last stretch if needed.
Sources checked on 2026-07-01: PC Gamer Tadpole guide, PC Gamer Alien Ruins guide, PC Gamer Celestine guide, and site item data.
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