FYI "military grade" is code for "cheapest bidder."

If it's any consolation, you can have fiber without jackets as long as they are cable-managed very carefully.

This is why should never-ever directly bury cables in the ground/walls/floor and ALWAYS use rigid PVC and/or flexible PVC tubes from site to site and pull the fiber or UTP cables through those tubes.

As an alternative if you are networking a single location and you don't mind seeing some finishing profiles on the walls (or want something easy in a pre-existing situation) you can also drill somewhere along the wall and feed the cables directly down to the floor or up the ceiling and cover them up.

But always, ALWAYS, make them easily accessible and easily removable.

Got plenty of experience to say no cable will survive a lifetime, and if you experience a problem without easy access you are fucked.

Was there a technical reason for not using corrugated ducts in the concrete, maybe because it's a shelter?

When you design, build or renovate your house, always plan for future replacement of cables and pipes!

First question, bomb shelter??

Next what popped in my head, “Military grade means, made by the lowest bidder.”

2cents...at my last job we used to buy only panduit cables..

If the point of a home lab is to learn useful lessons where your customers don't pay for your stupidity (or more politely: your learning journey) then this guy's next employer is definitely getting their money's worth.

But that reminds me of something: I spend money on hobbies, but I spend the absolute minimum amount of money possible on home IT research and learning. Fuck that noise: if my employer wants a lab, they can damn well pay for one.

The coils are too tight. The tension on the plastic pulled it apart.

Andromeda strain