Advanced Construction Sub is the T2 sea constructor. Their typical first tasks are upgrading your metal extractors, building fusion reactors and then advanced metal makers.

They have a higher build power than the T1 Construction Ship and grant a small boost to both your metal and energy storage. Guard them with other constructors or naval engineers to assist with building.

In addition to T2 economy structures, they are able to build advanced torpedo launchers and the underwater experimental gantry.