Relativity (sic) speaking, 'c' = 300,000kps (rounded off) is everywhere and everywhen foreground local closed systemic constant: Constant, in every one of an infinity of parallel universes (u) making up the boundary-less open systemic dimension of a multi-dimensional (multifaceted) Multiverse Universe (U).

There is no such thing as a naked singularity of "closed system" dimension. It cannot exist without a co-existing and opposing dimensionality of "open system" (and vice-versa). The naked singularity -- the Big Crunch -- of all of an infinity of blackhole singularities is a dual dimensionality, a binary both singular and plural. [A] "Mirror" mirroring itself to infinity: A Universe (U) and, at once, an infinity of paralleling universes (u): 'c'='0' / 'c' = '300,000kps'.

A universe traveler can travel through an infinity of paralleling universes, accelerating at some constant of 'gravs' (such as one Earth grav) forever. He would be traveling the open system, traveling boundarylessness, relativity to relativity, parallel universe to parallel universe, point to point -- plane to plane, never measuring the speed of light inside him and outside around him to be anything but 300,000kps. That constant of the speed of light being a matter of relativity, a matter of the closed system, local, foreground, and finite. Of course he would be entering opening systems ahead, and leaving closing systems behind, like exiting a constant of Big Crunch universe behind into a constant of Big Bang universe ahead (the universe behind vanishing into singularities / naked singularity). The odds of finding one's way back to starting point would then be one in infinity. Point to point travel; plane to plane travel. This traveler has good position, comfortably speaking.... and good momentum, comfortably speaking.... but exists and lives in ever growing uncertainty as to universe.