>That falls under the general heading of "weird-ass alien gear of
>unknown provenance". It appears to "submerge" the ship in the
>sub-ether, the sort of "sideband" to reality where FTL datacomm
>lives (making a galactic Internet possible), but matter isn't supposed
>to be able to exist there, as it's not a true parallel reality. The
>principles behind that drive are not understood, not least because
>only two examples have ever been seen (Sol Bianca and Unicron),
>and in neither case have scientists been able to examine them. We
>aren't even sure where that technology came from, although the most
>plausible theory to date has been that it's a relic from the lost
>galactic empire of Atlantis (ca. 5000 BC - AD 0).
>
>--G.

So Unicron is able to enter the sub-ether. That explains why the mail headers bounced in Cybertron Dreams.

BTW, this implies that standard tech is able to project messages into the sub-ether.

--rR