[x] It would be cooler if it was automatic.
You can't help yourself. Maybe
"I gotta be honest," you shrug, seeing an opening in her ego, "it would be cooler of it was automatic. Like, if you just walked up and it opened for you. Maybe some kind of facial recognition to keep it from opening for just you?"
Sanae giggles. "Or maybe make it voice activated? But I still think it's pretty cool for a secret base. I'm kind of jealous."
"A-anyway," Nitori says, shaking off "The door is just a door, it's not that important. And it's not a secret base, it's a lab. The most advanced one in Gensokyo, in fact. Come on."
Hastily, the kappa heads inside the door and down the huge stairwell behind it. The stairs are a bit more what you'd expect from a stereotypical secret lab - textured sheets of metal. Although, only the floor is metal, the rest of the cave is natural stone.
A dozen steps or so down the stairs, Nitori pushes something on the wall. With a rather powerful sliding noise, the door closes behind you. You hope you don't have to leave in a hurry.
The stairs... go on for a while. You stop counting over a hundred steps.
"Just how did you carve all this?" you wonder aloud, "This would be some serious work to do by hand."
Nitori, who had been silent until now, seems eager to boast about it. "Hmm. Well, actually - steam power! Steam powered tools, that is. The auto-pickaxe, and the super-smoother, and..."
She rattles off a few things that sound like weirdly named power tools. And it sounds like it was something that she's been working on for at least one human lifetime.
"But wait, steam?"
"Steam. It's a really convenient way to power things, you know! Running electricity all over the place is just a pain, and batteries are way too big for the power they hold. You just have to be careful not to run the pressure too high..."
You continue to descend. You suppose there's not much in the way of fossil fuels being produced in Gensokyo. "But wait, how do you power those cameras you were talking about earlier? Steam?"
As you pop your question, you finally set foot on level ground. The stairs end at the foot of another door - a heavy and metal one. Nitori stops and turns around, mostly ignoring your question.
"Now, a few safety rules," she says, "Don't touch anything without asking. And... well, I guess there's only one."
After getting affirmative nods from both you and Sanae, she turns around again. This door just slides open after turning the handle.
On the other side is a massive cavern. Like the cave leading down, the floor (and some distance up from the floor) are metal, while the rest is natural stone. Although the ceiling is decorated with ductwork and other various metal bits.
Along the walls, and in various piles, are... ridiculous amounts of clutter.
"So," Nitori says, walking up to Sanae, "Can I see your, uh, 'cell phone' again?"
Sanae, taken back by the sight of all the junk lying around, seems to not be keen on the idea. "Wait, what do you plan to do with it?"
"Well," Nitori says, "Mine doesn't work, and yours does. So I wanna take it apart and see why!"
Sanae looks mortified. "What? No! I've had this phone forever!"
Nitori pulls back. "It's the only way, unless you can just tell me how it works. And besides, I can just put it back together... I think."
[ ] Wander off while these two deal with it. But don't touch anything.
[ ] Back up Sanae. You can't just destroy someone's phone.
[ ] Back up Nitori. There's no cell towers in Gensokyo, anyway...