The Indefatigable-class marks a large departure in Sivadian naval doctrine, being Sivad's first line of carriers. The first and only craft to be completed to date has been the HMS Indefatigable, which rolled off the line in 3003. In reality, the Indefatigable-class is not a true carrier, but a hybrid between battleship and carrier to appease both the battleship admirals and carrier admirals. This distinction has lead some to refer to it as a battle-carrier. The vessel can carry 24 fighters of the Sivadian's Spitfire-class of fighter and sports four triple-barrel MkVII pulse turrets as its primary armaments.