From Rise: The Vieneo Province
DIHV is a faster than light spacecraft used to transfer large amounts of man and material between star systems. It is not capable of atmospheric flight and docks with TAC.
The vehicle does not exceed the speed of light in the strictest sense. It uses extra dimensional space in order to move between points in three dimensional space faster than light does. These extra dimensions are described in M-theory, which unites the constituent parts of Super String Theory, which in turn unites Quantum Mechanics and General Relativity.