NSA tapping undersea fibers?

Matt Crawford crawdad at fnal.gov
Fri Jun 1 18:29:16 EDT 2001

> Cable companies do this (from the surface) when they repair cables, but they
> usually cut the cable before separately raising the cut ends and splicing in
> a new section. I doubt that cable would be strong or extensible enough to
> lift uncut, unless there was a lot of slack from eg a previous repair.

To lift the midpoint of a cable 1000 units long by 5 units requires
only 0.067 units of slack, or the ability to stretch by 0.0067%.
(This takes into account the catenary shape of the lifted cable.)

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