Deep Biome Survival Guide

The PRAWN Suit and the Cyclops serve different deep-biome tasks, and most successful runs use both. The PRAWN is maneuverable, fast in short bursts, and harvest-capable — perfect for resource collection and tight cave exploration. The Cyclops is the long-distance carrier: it carries both your PRAWN and your spare Seamoth, has a built-in fabricator, and is the only way to comfortably travel between deep biomes without surfacing.

For 200–400m zones, a fully-upgraded Seamoth with Reinforced Hull MK2 and a sonar module handles most situations. Past 400m you really need the PRAWN for drills, grappling, and the Jump Jet Boost upgrade. Past 600m, the Cyclops is mandatory because no personal submarine has the crush depth or the storage room.

Deep biomes change the predator ladder. Stalkers and Bone Sharks barely register at 400m; the real threats are Reaper Leviathans, Ghost Leviathans, and the rare but catastrophic Sea Treaders. Each has a tell before it strikes, and learning them is the difference between a close call and a lost save.

Quiet engines, decoy modules, and careful sonar use are your best defenses. The Cyclops can survive a single Reaper attack if you repair afterwards with a welder inside, but Ghost Leviathans can appear in groups and require evasive maneuvering. Always plan an escape upward — the deep is not the place to fight when you can climb.

Personal oxygen tanks cap at 75 seconds with the High Capacity Tank, and that is rarely enough for a deep return trip. Most divers forget the math: a 600m dive costs ~25 seconds of O₂ just going down, and another 90+ seconds coming back up while fighting currents. You need at least two High Capacity Tanks and the Rebreather for serious exploration.

Inside vehicles, oxygen management is automatic, but the Cyclops and PRAWN can both run low on internal power if you over-use exterior floodlights. Recharge cells with the Battery Charger inside your Cyclops, and always carry spare Ion Batteries for Power Cells. Treat the Cyclops as your recharging hub; it can refill a PRAWN in minutes if you have a Thermal Reactor running.

Even seasoned divers get caught. The Cyclops floods when hull integrity fails, so you must always know your escape route. The Cyclops dashboard shows damage in real time — patch breaches with the welder from inside before pressure becomes critical. If hull drops below 10%, abandon ship and pilot the PRAWN upward; the PRAWN survives most Leviathan attacks if you use Jump Jet Boost and Stasis Rifle.

For PRAWN out of power: the PRAWN has a slow passive recharge but it can be resurrected by docking on a powered Seamoth. For oxygen emergencies at depth: the Airbladder fragments are scattered even at 300m, and a properly timed Airbladder when below 5% O₂ can rocket you to the surface in seconds. Avoid getting into a situation where these backups are your only plan — plan your depth before you leave.