Yes. Reaper, Ghost, and Sea Dragon Leviathans can attack or physically affect the Cyclops. The official Subnautica announcement confirms that aggressive creatures can damage it; the exact behavior depends on the leviathan.
What each leviathan can do to the Cyclops
| Leviathan | Reported effect | Evidence and limits |
|---|---|---|
| Reaper | Can attack the submarine. | The Cyclops page on the Subnautica Wiki lists Reapers as potential attackers; the cited material does not give a specific damage figure. |
| Ghost | Adults can push, drag, or overturn the Cyclops. | Reported on the Ghost Leviathan page on the Subnautica Wiki. Physical displacement can threaten the sub even apart from hull damage. |
| Sea Dragon | Can slam the Cyclops with its arms and attack with fire breath. | The Sea Dragon Leviathan page on the Subnautica Wiki reports 250 Cyclops damage from a swat and 500 from fire breath. These community-wiki figures are not independently verified against an official technical source here. |
The official announcement establishes the general damage mechanic, but does not document these creature-specific behaviors. The individual behavior and damage details above come from community-maintained wiki pages, so treat exact figures as reported game-stat entries rather than verified measurements.
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How to reduce the risk
The Cyclops reference recommends precautions that can help you avoid attracting or withstand attention, but it does not claim any one method guarantees safety from every attack.
- Travel at slower speeds and use Silent Running.
- Turn off exterior lights or the engine when appropriate.
- Deploy a creature decoy or flee if a leviathan engages the submarine.
- Use the Shield Generator as a defensive option.
Silent Running and Cyclops operating modes also appear in the official Subnautica update announcement.
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What is—and is not—established
The cited sources support the answer that leviathans can attack the Cyclops, and they describe distinct threats: attacks, physical displacement, and Sea Dragon fire breath. They do not establish a complete, version-specific ranking of which leviathan is most dangerous, nor do they verify current in-game behavior for a particular game version. The official Subnautica wiki homepage identifies itself as an official community-maintained wiki, but the specific creature details cited above are from the community wiki pages linked in the table.
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