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New undersea cable tech listens for sabotage — can be retrofitted to existing fiber optic lines
(www.tomshardware.com)
this post was submitted on 19 Mar 2025
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You can hear to some level, the boats and actions in the vicinity of the cable. So it might provide evidence in case of a break.
It also lets you know if the cable is moving round on the seabed etc, this is useful as it can cause wear.
I seem to remember it being used to check the health of power cables too (they have fibre cables embedded within them)