While we are imagining unlikely thing, I'm going to imagine there are instructions from aliens (yes, the same ones that actually built the pyramids, don't ya know) on how to build a faster than light drive.
But those instructions actually involve the assembly of an AI which develops nano technology, disassembles our world and solar system in order to build and dispatch pyramid assembling drones throughout the galaxy.
Why is it unlikely? I’m certainly not suggesting aliens. Just the idea that if there is a chamber and it is unopened and contains non-stone artefacts (wood, food, fibres, bone) we could finally carbon-date the structure and corroborate or refute the prevailing wisdom on the timeline.
