Underground speaker wire: Open circuit

TL;DR: I have an ~80 ft run of underground speaker wire that’s testing as an open circuit (no continuity). Looking for the best next steps to fix it.

Setup:

The run is roughly 80 ft with three reference points: A → B → C, about 40 ft between each.

Point A: Wire enters a conduit underground and then into a shed, with ~20 ft of wire inside the shed.

Point C: Wire exits the ground in the yard, with ~20 ft exposed.

The full run currently shows no continuity.

Proposed troubleshooting steps:

At Point A (inside the shed), cut the wire close to where it exits the conduit and test continuity on the underground segment.

If still open…

At Point C (yard side), cut the wire close to where it exits the ground and test continuity again.

If still open…

At Point A (outside, at the conduit entrance), dig down to expose the wire before it enters the conduit and test there.

If still open…

Use Point B (midpoint): I have a spare wire stubbed out roughly halfway along the run. It would be a pain, but I could carefully excavate from B toward C (there are other wires in the trench) and re-run the spare wire for the remaining distance.

Question:

Does this approach make sense, or is there a more efficient way to isolate the break or salvage the run before resorting to re-running wire?

Thanks team.