A causally connected superluminal Warp Drive spacetime
  It will be shown that while horizons do not exist for warp drive spacetimes traveling at subluminal velocities horizons begin to develop when a warp drive spacetime reaches luminal velocities. However it will be shown that the control region of a warp drive ship lie within the portion of the warped region that is still causally connected to the ship even at superluminal velocities, therefore allowing a ship to slow to subluminal velocities. Further it is shown that the warped regions which are causally disconnected from a warp ship have no correlation to the ship velocity. 
F. Loup, R. Held, D. Waite, E. Halerewicz, Jr., M. Stabno, M.   Kuntzman, R. Sims