The unofficial expansion to Planetary Annihilation Titans, adding in new units, redesigning the game play and pacing, and refocusing the game around the openness of strategy found in spring games while increasing meaningful micro and reducing meaningless choices.
Amphibious factories are one of the new ways in Galactic Annihilation to conduct cross-layer invasions, in this case sea to land. These factories, built on the sea floor, are used to construct amphibious units such as Stompers and Obliterators, allowing you to reach out and crush a land based foe when they are too far inland for ships to bombard.