How hard is it to destroy a pipeline? Do you actually need an underwater UAV, or might lowering explosives on a rope and a timer from a small boat do the job?
Remember - water transmits compression waves really well, and the pipe is the only compressible thing around. The sea there is only 200 meters deep, so lowering it on a rope at slack tide and with a good GPS on the boat, I'd imagine you'd be able to get explosives landing within 10 meters or so of the pipe.
Relatively hard to get right. You have to deploy a ship (maybe merchant ship) and a specialized crew to the actual location, undetected, at the right time. A lot can go wrong.
I suppose Austria, Hungary, Romania, Czechia, et al do not have the resources to pull this off. Remember, it's only been a couple of months that this gas stand-off is this tense. The only countries in Europe who have the means to act fast on this are the UK, France, Italy, Spain, maybe Greece (I don't think any of them would do it - there's no reason for it whatsoever), and Poland.
How hard is it to destroy a pipeline? Do you actually need an underwater UAV, or might lowering explosives on a rope and a timer from a small boat do the job?
Remember - water transmits compression waves really well, and the pipe is the only compressible thing around. The sea there is only 200 meters deep, so lowering it on a rope at slack tide and with a good GPS on the boat, I'd imagine you'd be able to get explosives landing within 10 meters or so of the pipe.