

If by “signal” they mean the numbers station which appeared at 7910 kHz and moved to 7842 kHz, then Iran is attempting to jam it.
Normally, one would not expect a country to jam its own means of communications, unless they are playing 5D chess or something.






Sonar-equipped and fiber-controlled submersible drones / robots can. Ordinary sea drones are just small boats with cameras for finding a target, typically made of aluminum or fiberglass. They typically don’t have sonar, ride on the surface, and their magnetic signature needs massive amplification to trigger a mine.
Signature amplification might be doable, though.