>>11838791>LEDs require a number of different elements to make and you ain't gonna get all of em' practically from one fucking cave. Of course you could get them from one cave. Even seawater has every element. Just about any cave will have everything even though the concentration would be low.
It was not specified as to how advanced the civilization would be technologically. A stone age civilization is not going to live underground. Our current civilization just might if expansion was limited or not allowed and storages were huge, although it's a stretch.
>And why would a civilization capable of making LEDs and some ridiculous power source to power em' decide to hide in a fucking cave forever? Maybe it's safer there and they got some nice holodecks.
>Such civilizations couldn't hide too, cause they'd have to dispose of waste heat and that's gonna get noticed. There's plenty of heat underground anyway so you could easily hide any waste heat. Or dump it in the ocean.
>Any digging would probably get noticed too as that has a seismic signature.There's no requirement for digging unless you are expanding. And digging can be done without a noticeable seismic signature when it's done slow and nice enough. Especially if you're deep underground.
