> The point is they bothered constructing probes.

Right, why did somebody make this metal cylinder covered in elaborate symbology and then place it here? Was this place of great importance to them? What were they trying to communicate to me by constructing the cylinder and placing it?

It's just a discarded coke can. You are the one who decided it's required to have great significance. If you haven't read "Roadside Picnic" I suggest at least reading a summary.