Depends how far down it goes and what is laid alongside it.
I worked on birder control system design for a couple of years, fibre-optic cables can identify not only digging but also footsteps, whilst discarding animal steps, over extremely long stretches to allow guards to be dispatched. Cable lengths can be around 100km, where you need a remote power supply and comms connection back to the control centre.
e.g.
https://www.optasense.com/documents/...re_Dec2020.pdf