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Keep in mind that it's not just reaching the depth -- that you gotta have the payload to haul an explosive package and at least enough manipulation ability to place it, and I don't think that that $5k UUV has any manipulation capability, from a quick glance. Though the payload issue isn't large, if you're gonna rely on a tether, are willing to wait, and are willing to make your explosive package roughly neutrally-buoyant.
But, yeah, in terms of vulnerability, a $30k or $5k UUV, generally-available to the public, is more-or-less identical -- like, there's no real bar to getting either. And I can imagine that $30k definitely isn't the lowest out there.
Yeah, I dunno how you'd counter it. You could have sensors and some kind of counter-UUV system down there permanently, all along the length of the thing, and at greater cost, that could maybe stop one UUV and warn authorities of trouble at that point, but I don't know whether that could be combined with other capabilities to translate into an effective defense of a whole pipeline/cable.
In WW2, we defended convoys, but that was a single point, not something always spread out along the whole ocean.
It's especially an issue for Europe, which has a lot of submarine infrastructure in shallow seas surrounding the continent. If the EU could get their politics together, they could probably do the equivalent of eminent domain, cut infrastructure corridors overland, but links to Scandinavia, the British Isles, and Africa are still gonna be submarine.
Maybe some sort of cheap buoy network outfitted with sensors, GPS, and a longterm sustainable power source
Idk how feasible that would be and can't even estimate how many buoys it would take to cover everything
But you could anchor or even connect some of them directly to the pipeline itself. If it's a network, having every few buoys connected via fiber optic to the pipeline would allow them all communicate and transmit data fast af
Might be possible to collect submarine comms too if the tether acted like an antenna haha