Drillship

The Drillship is a mobile, worm-like structure with a large drill affixed to the front. It serves as the player's main base of operations, can dig underground to provide protection from volcano eruptions, and can be installed with various modules used for crafting and storing items, research, and generating power.

Drillships are destroyed if all their hull slots, including those not fitted with modules, are destroyed. There are an equal number of hull pieces on the left, right, and top of the ship, although only a couple module types can be placed on top.

Expansion
The drillship can be expanded up to four times as the campaign progresses. Each additional segment adds more hull pieces and space to the drillship. Keep in mind that more segments mean the ship will take longer to fully dig underground once given the order to submerge, so it must be given the order sooner as the eruption nears.

9 hull pieces, ~10 seconds to submerge
 * 1 segment

18 hull pieces
 * 2 segments

45 hull pieces
 * 3 segments

72 hull pieces, ~30 seconds to submerge
 * 4 segments

COG drillships
COG drillships can be found throughout the world. They can appear in spots available to the player as well as the surrounding area. They will often spawn COGs that will march on the player's ship; this occurs more frequently in later areas.

COG drillships can be destroyed the same as a player's, by destroying all hull pieces on the ship. Upon the last piece being destroyed, there will be an alarm followed by a small explosion killing anything inside (including the player) before it becomes a drillship wreckage. This wreckage will be salvageable with the Pickaxe to yield upgrade components.

When attacking COG drillships, Grenades are highly recommended, as the Shotgun and Pickaxe destroy modules very slowly and shotgun shells are more expensive in terms of resources. Check if it has any turrets and try to find a way inside the ship that avoids their field of fire, otherwise find something to take cover behind and throw grenades at turret. It takes 3 direct or close hits from a grenade to destroy a turret. Once inside, modules on all sides can be destroyed more efficiently by landing grenades in the center of the room, but keep in mind that if holes are made before turrets are destroyed, they may be able to shoot inside. Storage modules and chests can be looted, but the ship can not otherwise be interacted with. The ship will not submerge while the player is in it, but will attempt to do so as soon as they step outside, cancelling if they step back in.