"That's the best news I've heard since we got the mithril in the first place!  Let's go do that!"

"Er, what about that time we got to the escape pod before falling out of hyperspace in the middle of nowhere?"

"But yes, let's go see that computer!"

She will produce a blue handheld computer, apparently from nowhere.

Parrolan takes out from his coat pocket a box about twice the size of an (Earth-vintage) smartphone, and runs his thumb over a sensor to unlock it.  The package inside is wrapped up in a black cloth, which he carefully folds back one corner of to reveal a jagged corner of something that glistens in the sunlight.

"What sensors do you have on that?"

Mercury can give him a detailed run-down of the sensors in the laptop. It's a wide array - the designers seem to have been aiming for 'everything', and working with technology far in advance of what 21st century earth has to offer, extensive magic, skilled engineers, and an enormous budget.

"Shall I scan the mithril?"

Parrolan recognizes...

... less than half of what she mentions, actually.  Even with the language spell translating the terminology, he studied politics and logistics, and the only sort of engineering certification he came anywhere close to was civil.  (Which, in half of human space, isn't considered a proper engineering certification at all.)

But he does recognize enough to be reasonably confident that if the Alorican materials engineers were hearing this, they'd think this scanner was well worth using.

"Let's do it."

She will scan the mithril with the computer.

... It's an alloy of several metals with a really weird crystal structure.

In fact, the crystal structure appears to be at least four-dimensional.  What the scanner here can see looks like a cross-section of something broader in another dimension.  Maybe if there's another scanner meant for tracking things in hyperspace... if the Sailors have such a thing?

"... huh.  How in the world did the Tenevri even make this?"

The computer has a scanner for tracking things in alternate dimensions. It doesn't have a pre-installed setting for hyperspace specifically but if the mithril has metallic bonds going into it it should be able to locate it by following those and calibrate itself to see how exactly the structure extends into it.

And so you get a pretty standard-looking crystal lattice structure.  Or it would be a pretty standard, except that it's in four dimensions, so the structure looks different just like a three-dimensional lattice isn't just a two-dimensional lattice rotated!  It's pretty clearly made for durability, even aside from the strange dimensional structure.

And there're also a few breaks in the lattice - maybe damage?

Mercury will show and explain these results to Parrolan.

"... That doesn't explain everything.  Even if we could duplicate it -"

"- It's the start to everything!  It's -- it's the sort of thing I'd expect to hear.  If you told me 'there's a way to build things stably extending into hyperspace; what happens a while down the road' I'd expect something on the order of keeping watch for ships in hyperspace and knocking them out of it and things like the Tenevri have been doing."

"Yeah, but... we need that long research project.  I was hoping this would tell us how to duplicate everything right away.  Will the Tenevri give us the time for that project?"

"We're in a whole other universe now, aren't we?  And we'll be able to get back at any time after we left, right?"

"I hope so, but this is the first I've heard of these alternate timelines, so I don't know how to expect them to behave."

"Then we've got all the time in the galaxy!"

All the time to have fun!

"Where do we go to see more of your friends?"

"... We might."

"We mostly do social stuff under our mundane identities and only use the Sailor Senshi identities for fighting, and we brought the whole team to attack the Black Moon base, so there isn't really anyone else we can introduce you to without compromising our identities."

"That's not true - there's people we've interacted with enough in the course of saving them to know they seemed nice and got along well with us. We could take these people to meet some of those. Or what about the Four Heavenly Kings - they were friends with Tuxedo Mask before the fall of the Moon Kingdom, right? We could see if Kunzite and Nephrite were resurrected when we were. And there's Venus' cat, he's pretty much part of the team. Ail and An know our identities and have their own secret identities to meet under, and so might Bunbo depending on how Metalia's death affected the Youma. And there's the image of the queen in Eternity Main."

"Image of the queen?  Like... a computer model of her?"

(Computer models have developed since the days of asking a primitive AI to pretend to be a specific person, but they're still noticeably different from the actual person.)

"That's an interesting way of separating your official and personal identities... I don't think I'd like it myself, but I know some people who might.  What led you to do it this way?"