On: AT&T Long Lines – A Forgotten System (2018)

[fomine3]

> One of the new innovations was the use of fiber optics. Fiber optic lines are typically located underground, eliminating the vulnerabilities of earlier coaxial-based cable systems.

Why coax cables can't be buried to underground?

[quercusa → fomine3]

They were [0]. From the older, amazing long-lines.net site.

0: https://long-lines.net/tech-equip/coaxial/4000mi-trench.html