Subnautica 2 Depth Modules — Best Vehicle Upgrades

Subnautica 2 depth modules are the most important vehicle upgrades in the game. Without the right Subnautica 2 vehicle depth upgrade, your vehicles will crush under the pressure as you descend into deeper biomes. This Subnautica 2 depth modules guide covers every depth module variant for each vehicle — Seamoth, Prawn Suit, Sea Truck, and Cyclops — with the materials required, maximum depth per module tier, and optimal upgrade strategies that prioritize your progression. Following the right Subnautica 2 depth module Mk upgrade path saves you from farming rare materials multiple times.

Seamoth depth modules

The Seamoth has three Subnautica 2 depth module tiers. The Seamoth Depth Module MK1 increases crush depth from 200 meters to 500 meters and requires 1 Enameled Glass, 1 Plasteel Ingot, and 1 Lubricant. The MK2 extends to 700 meters and needs 1 MK1 plus 2 Plasteel Ingots and 1 Nickel Ore. The MK3 pushes to 900 meters using 1 MK2 plus 2 Kyanite and 1 Aerogel. The MK1 is the first Subnautica 2 vehicle depth upgrade you should build — without it, you cannot safely explore the Thermal Spires or Jellyshroom Caves. The MK3 costs significant rare materials, so consider whether the Prawn Suit is better for those depths. The Seamoth Subnautica 2 depth module MK3 is only worth the investment if you use the Seamoth as your primary exploration vehicle.

Prawn Suit and Sea Truck depth modules

The Prawn Suit has four Subnautica 2 depth module tiers, reflecting its role as the deepest diving vehicle. MK1 (500 m to 900 m) needs 1 Enameled Glass, 2 Plasteel Ingots, and 1 Diamond. MK2 (900 m to 1,100 m) requires 1 MK1 plus 2 Plasteel Ingots and 1 Nickel Ore. MK3 (1,100 m to 1,300 m) takes 1 MK2 plus 2 Kyanite and 1 Enameled Glass. MK4 (1,300 m to 1,500 m) needs 1 MK3 plus 3 Kyanite and 1 Aerogel. The Subnautica 2 vehicle depth upgrade path for the Prawn Suit MK4 is the most expensive in the game but necessary for Deep Zone exploration below 900 meters. The Sea Truck Subnautica 2 depth modules follow the same pattern as the Seamoth with MK1 (500 m), MK2 (700 m), and MK3 (900 m). The Cyclops has a single Deep Depth Module Mk1 that extends crush depth from 300 m to 800 m, requiring 3 Plasteel Ingots, 3 Nickel Ore, and 1 Enameled Glass. Plan your Subnautica 2 depth modules progression around your chosen vehicle strategy.

Optimal upgrade strategy

The optimal Subnautica 2 depth modules progression prioritizes the Seamoth MK1 first (opens Thermal Spires), then the Prawn Suit MK1 (opens Jellyshroom and Deep Zone entry), then the Prawn Suit MK2 (full Jellyshroom access). Skip the Seamoth MK2 and MK3 unless you prefer the Seamoth over the Prawn Suit — the Prawn Suit Subnautica 2 depth module path is more resource-efficient for deep exploration because it reaches 1,500 meters with MK4 while the Seamoth tops at 900 meters. The Cyclops depth module is optional in early access because no biome requires a Cyclops at its current max depth of 800 meters. Each Subnautica 2 depth module Mk upgrade requires the Vehicle Upgrade Console built at a Moonpool — you cannot craft depth modules at a standard Fabricator. Build your Moonpool early and keep it stocked with Plasteel Ingots and Enameled Glass for efficient Subnautica 2 vehicle depth upgrade crafting.