404 Light Years

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This is the borderline that lies between the seventh layer and Moon Cell‘s core. Virtual Spiritrons are made of light, and it’s warned that at the speed of light it would take 404 years to get past this border and to the computer addresses which lie beyond. This essentially communicates “that address doesn’t exist” to anyone/anything attempting to pass.
It’s actually an infinite distance that cannot be covered even if you try for centuries.
The only thing that can serve as a bridge across the borderline to connect Moon Cell‘s core to the normal address space is the arena that Moon Cell made to summon the victor of the Holy Grail War.
…Is how it’s supposed to be, but BB used an imaginary number space to force herself to become an infinite concept, and by using a fake arena she managed to break past the borderline.
When she decided to take on the massive problem of getting past 404 Light Years, her words were filled with determination, “Blossom Vaportrail. 38000 Light Years.”
A vaportrail is the stream of vapor left behind by airplanes when they fly. 38000 is suggestive of the distance from the Earth to the Moon.

Fate/EXTRA Material: Encyclopedia of Fate/EXTRA