[MHGinTN]

Gravity and inertia are closely related. Those 'craft' don't operate on petro chemicals and the vacuum energy is permeating everything already. IF those 'craft' are not from our solar system, then the operators have a means to communicate at greater than light speed. And, BTW, light speed is only a speed limit to things with mass or that have 'universe recognized' mass. IF you mask the mass, you travel 'outside the three of spatial and one of temporal. But you are still 'in the Universe', just not the Universe we now sense with our temporally 'locked' selves and instruments.

Without time, events do not occur in the Universe God created.

Without space, a thing does not exist in the Universe God created.

[PIF]

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.