Cargo Depot (6)
The Cargo Depot (6) is a large auxiliary dock which allows for a Cargo Ship to dock at the island once one has been discovered and repaired. It features a flat dock space with connection slots for the addition of four (6) Cargo Depot modules, a 163 unit Diesel tank for refueling Cargo Ships, and an accompanying Pipe connection to replenish itself.
In order for the Cargo Ship to arrive and be able to unload cargo, the player must attach and build at least one Unit Module (L), Unit Module (L), or Fluid Module (L). While there are also lower-capacity (M) variants of each of these modules, the larger side modules are unlocked by the same Cargo Depot III research which unlock the Cargo Depot (6) itself. As a result, pairing of the (6)-size dock with the (M)-size modules is uncommon.
Cargo Depot (4) cannot be upgraded to Cargo Depot (6). Instead of the upgrade, you can deconstruct Depot (4) and newly construct Depot (6) to the same (or different) space. Importing resources will stop while Depot is reconstructed. So, it is recommended to have enough resource stock before reconstructing an important Cargo Depot such as the one used to import Crude Oil.
Selection and Configuration of Modules
See Cargo Depot (2).