Without time, events do not occur in the Universe God created.
Without space, a thing does not exist in the Universe God created.
See the Video I posed at #68 for a different, but similar explanation. Basically, a craft captures a local gravity pocket within which the occupants ride, the craft itself skims above the gravity field so that the faster the craft goes, the faster it can go - as I remember.
The occupants remain in a one gee field - no matter what the external gees might appear to an outside observer - so the craft can go at most any speed changing direction instantaneously without any effect on the occupants.