Thing is.....nowhere is currently a good place for nuclear disposal. See: Yucca Mountain.
But near a river?! Gtfo of here with that stupidity.
Each one of these machines is know as a HPHT cubic press (high pressure high temp). It is not the only way to make a diamond but it is one of the cheapest. A new machine will run you about $450,000. Synthetic diamond wiki, or buy your very own new or used cubic press.
Edit: the factory pictured is relatively small, here is what a large operation looks like.
Being trained in archaeology I'm loving OP's question. I had no idea there was a musical instrument that old. Rock drums are quite old as well, but I don't recall how old.
What's most amazing about this flute is that age and location make it very possible that it was made by H. sapiens neanderthalensis
Neanderthals were much more advanced than people give them credit for. Some of the oldest jewellery comes from Neanderthal sites. Anatomically they were bigger than modern humans. I would like to think (or hope) that it was a genetic or viral problem that wiped them out, not us.
Wait, humans had reached GERMANY, let alone Europe 400,000 years ago?! This is definitely new to me!
I've always found wooden artifacts to be fascinating. We've got a pretty good idea of the evolution of stone tools, all the way from what are basically apes banging rocks together all the way up to sophisticated spear heads, arrow heads, and other tools. They're stone, so they last a long time. But wood is soooo much easier to work with that of course our ancestors must have been working with wood for a lot longer before they started working with stone. But there's practically no record of it since wood decays so fast. Who knows how long tribes of primitive hominids were developing different types of tools, weapons, shelters, etc. with wood before they started leaving archaeological traces with more durable materials? Just thinking about that "arms race" and how little we know about it is amazing.
You would have fun looking up bone artifacts. Most of the very old artifacts are crafted from bone, antlers (bone), or ivory.