USS Tau (NCC-1871-D)

The USS Tau (NCC-1871-D) was a modified Federation Prometheus class battleship in service in the late 24th century and the direct successor of the USS Tau (NCC-1871-C). The USS Tau stand under the command of the swedish Capitan Julius E. Olson, he has a romantic affair with Capitan Ezri Dax in 2383 till 2386. One year after the completion of the ship, the Corps of Engineers upgraded the USS Tau with accessorily six phaser cannons and three torpedo rooms.

Secret mission and devices
However the most important advancement was a the secret installed Quantum Slipstream Drive, there only activate by the Capitan on the bridge. All this upgrades are installed for a one and only matter, to stop the top secret project they called NX-93091, ever should be anyone to steal this totaly dangeres instrument of doom.