>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),

Didn't the Silent Service boats - Lief Erikson(sp?), et al - also use it? They haven't appeared for a while though. I recall they had a 'submerge/surface' effect.

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