THe D Kyr class has a unique design with circular nacelles that fold into a horizontal position when not in use or when deploying a support craft that docks within the engine loop.
It has an auxiliary control room on the engineering deck that can operate all of the ship s functions independently of the bridge
When the Enterprise NX-01 was to have its mission cancelled, the D Kyr was sent by Ambassador Soval of the Vulcan High Command to rendezvous with the Enterprise and recover Subcommander T Pol.