Guide · ~15 min read

Cyclops Submarine Mastery

Pilot the Cyclops like a pro. Cockpit controls, module loadouts, PRAWN and Seamoth docking, stealth mode, and the rare situations where you should leave the sub behind.

Pilot Controls

The Cyclops cockpit is more complex than the Seamoth because you have separate controls for forward, vertical, lateral, and periscope. The default mouse-and-keyboard mapping puts WASD on lateral/forward and Space/Shift on vertical. Spend 10 minutes inside the drydock before launching — you will save hours on dead-of-night mistakes otherwise.

Three HUD readouts matter constantly: hull integrity (%), engine temperature (overheating can seize the sub), and depth relative to current biome. When engine temp crosses 70%, reduce throttle — overheating is the number one cause of stranded Cyclops in the deep zones. Engine noise tier also matters: silent running reduces Leviathan detectability substantially.

Movement

Throttle (5 tiers), Vertical (Space/Shift), Lateral roll (Q/E).

Periscope

Long-range camera with zoom, 360° rotation, independent of vessel heading.

Silence Mode

Toggle to drop engine noise. Drains power faster but reduces Leviathan aggro radius.

Module Setup

The Cyclops holds six module slots and how you fill them defines how the sub handles. Depth Modules go first — the MK1 unlocks 700m, MK2 unlocks 1100m, and MK3 unlocks 1700m. Fill all three slots before any other upgrades if you plan to deep dive.

Next priority is the Sonar Module (faster detection of creatures in the dark) and the Engine Efficiency Module (cooler operation, faster response). Save the Decoy Tube Module for expeditions into Leviathan-heavy zones; it works in tandem with the Shield Generator if you craft both.

Recommended Loadout

  • Depth Module MK1 / MK2 / MK3
  • Sonar Module
  • Engine Efficiency Module
  • Decoy Tube Module (optional)

Avoid This Setup

  • No Depth Module in any slot
  • Two Shield Generators (stacking is wasted)
  • All three Decoy Tubes (one is enough)

Docking PRAWN & Seamoth

The Cyclops has a single Moonpool that can hold either a PRAWN or a Seamoth — not both at once. To dock the PRAWN, approach the Moonpool from the front, slow to half-speed, and align with the magnetic guide line painted on the lip. The PRAWN's grappling arm can also self-park by aiming at the dock and pressing interact.

Docking inside tight caves takes practice. If the cyclops is moving and you cannot line up perfectly, dive below the moonpool, lock orientation with Shift, then ascend to slot in. The Seamoth docks faster because it has built-in magnetic clamps — just tap the dock and release the throttle.

Pro Tips

  • Align magnetic guide line within 10° of heading before approaching.
  • If misaligned, reverse and circle — never ram the moonpool.
  • PRAWN docking is 25% faster at half-throttle than quarter-throttle.

Stealth Mode

Stealth mode is a toggle that turns off the engine and dramatically reduces Leviathan detection range. Combined with the Sonar Module, you can move through Leviathan-heavy biomes in long silent drifts instead of being forced into a panic-driven dive. The penalty is that you cannot move vertically without breaking stealth.

Use stealth mode while coasting downhill through the Lost River; pair it with the Decoy Module set to one-second burst to distract passing creatures. Do not stay in stealth longer than 90 seconds without checking your battery — the Cyclops loses internal power more quickly while silent-running, and you will not get a warning beep before lockout.

When to Use

Traversing Reaper Leviathan patrols in the Mountains, descending into Lost River, or escaping mid-fight by drifting past a creature.

When to Avoid

Above-water travel (you cannot surface silently), tight canyon navigation (drift speed is too slow to maintain control), or active Leviathan chases.

When Not to Use

The Cyclops is overkill for short, shallow exploration. Bringing it into the Grassy Plateaus or the Kelp Forest is wasteful — you lose mobility, you have to manage engines, and any stuck Leviathan can ruin your run. Stay in the Seamoth until you need real depth.

Leave the Cyclops docked at base when you are doing wrecks, mini-dives, or cave exploration. Tight corridors are difficult to navigate and the repair cost of any breach is high. The PRAWN is the right tool for tight work; the Cyclops is the right tool for transport and carrier ops.

Use the Seamoth Instead If:

  • Target depth is under 200m
  • Exploration is in narrow wrecks or caves
  • Hull risk is medium and you cannot afford a Cyclops loss

Tips & Warnings

Common Errors

  • Docking with too much throttle damages the moonpool
  • Forgetting battery check during silent running
  • Flooding interior by ignoring breach alarms

Power User Moves

  • Save the game before every Cyclops dive
  • Carry a Repair Tool inside at all times
  • Use the fire extinguisher near the engine if a fire starts

Related Guides

Frequently Asked Questions

Should I build the Cyclops early in Subnautica 2?

No. The Cyclops costs more materials than every other vehicle combined and is best saved for mid-game after you have the PRAWN and at least 1 Depth Module MK3. Bringing it into the early game often results in losing it before you can recover the investment.

How many modules can the Cyclops hold?

Six upgrade slots total: three Depth Modules, an engine efficiency module, a sonar module, and one optional decoy or shield module. Slot count does not change with hull upgrades, so plan your loadout carefully before spending rare materials.

How do I dock the PRAWN Suit on the Cyclops?

Approach the Moonpool from the front, slow to half-speed, and align with the magnetic docking line. The PRAWN's grappling arm can also self-park by aiming at the dock and pressing interact. Practice docking in calm shallow water before attempting it in deep or tight caves.

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