These devices are why it pointless to spend billions on 3 or 4 new nuclear subs
The stupid cnuts at parliament (of all sides) just don't get it as usual.
The bad guys will have 1000's of automated sub killers following & hunting down our brand new old tech.
But I guess it's all about caring for the shareholders of the old tech builders and to hell with the people paying for it. We look hard and take your safety seriously. I call ballcocks.