I have no idea what this is, but I saw it as a chance to try out Epic's Reality Scan beta before going for a beer at Põhjala Tap Room.
I'm rather impressed as I only spent about 1–2 minutes capturing images on my iPhone 11 Pro. It's resolved quite a bit of the internals and smaller pipes.
The process itself was new to me with the in app guidance and setting the bounding box for the scan. Will definitely be trying this out more.