In my line of work utility pipeline. Waterline, storm drain and sewer. It is a common occurrence to locate the power, gas and cable lines before we do heavy excavation. The fiber lines especially have put several businesses under for the cost of repairing. My dad pulled up to a job one time to get started and there was a fella leaning up against his excavator tracks. They exchanged good mornings and the man asked my father what he planned to do with his machine. My father replied lay some storm drain line with it. The man told him there was a high profile fiber optic line buried nearby that handled all of the credit card transactions for BP gas stations between Georgia and California. He kindly let my father know there has never been a small business that damaged the line that has ever stayed in business! My father asked the man how he knew it was there and how he knew he was about to start digging near it. The man replied that they flew the area over the fiber line with a helicopter every four hours. Needless to say my father never damaged the fiber line.
that was probably a good number of years ago
I had a instructor in night school that had that job , he flew a twin engine cassena in several hundred mile triangle every day over fiber runs watching for construction , road work , backhoes , drain tile work ect..
would radio it in and they would send someone out to check it out on the ground
at the time a splice was around a million dollars
then a guy came up with a bury able boot and brought the splice down to around 30K and just like that he was out of a job flying every day
splices cost less than that now
I work in phones and customers get things gut fairly often , but not as much as they used to
for a while there was a particular interchange in Kansas city that they seemed to cut a major cable every year for a while. the one year they didn't cut it the entire thing flooded and it failed that way.