The Hidden Fleet is an NPC faction in SR 2.5 based on the older Hidden Fleet special combat. At the beginning of the round, they controlled half of Skytopia, with the other half being controlled by pirates. Very little is actually known about the Fleet, due to lack of intelligence reports. Their relationship with the Pirate Faction remains unknown, though it seems highly unlikely that the two are anything more than tenuous allies at best. After all, the enemy of my enemy is my enemy's enemy - no more, no less.