[xhrpost]

Nitpick, I don't think you're going to just run bare fiber outdoors, not even indoors. You would need to first run your own ducting/conduit and then have the equipment to pressure force the raw line through the shielding. So, much more expensive. But you can get outdoor rated cable with moisture absorbing gel for not too much I believe (struggling to find a price). Some even come with wire-mesh already attached in the event you have to hang it between elevated positions (like telephone poles). But you would need all of that for a copper run outdoors as well so it doesn't change your point.

Back to your point, fiber came to my mind as well. Why bother running CAT5/6 when you can just run fiber? Maybe its meant for existing infrastructure? But if that's the case, what was utilizing that infra before? Is it just in cases where you happen to have phone lines running between buildings?

[snickmy]

what does 'pressure force the raw line through the shielding' means ?

[LargoLasskhyfv]

Blowing the fibre or cable with compressed air through the empty 'speed pipes'.

As in one end of the fibre is connected to some sort of plug, while the rest is on a spool, the plug is then inserted into a narrow pipe, and pushed through it by pressure.

Pick any: https://www.youtube.com/results?search_query=blown+fibre+ins...