Subnautica: Cyclops - how to repair? Subnautica Guide and Walkthrough

The Cyclops is a relatively tough submarine. The majority of underwater fauna will be unable to deal any significant damage to it. Especially once you equip it with additional shields. The only creatures that can really make a dent in, or in some cases even destroy the Cyclops are the aggressive Leviathan Class organisms, such as the Ghost Leviathan.

Once the danger is over, you can assess the damage. A hologram of the vessel, showing the locations of damage will appear near the control panel of the Cyclops. This will enable you to check what components have to be repaired.

Next, go outside and find the damaged hull sections. Treat them with the repair tool. If you've fixed everything there was to fix return on board; the computer will inform you of the vessel's current condition.

The damage may be visible on the inside as well, but there's nothing you do about it from here