what impressive is it looks like a professional design and construction, not DYI like for example those Columbian drug smuggling submarines.
But both the submarine and the ASB are marvelous creations of the human mind to resist the state overreach.
It makes me wonder which technical marvels we are not seeing, and how much bigger China economy could be if only we let innovators freely innovate: selling better submarines to Columbian cartels maybe could lead to better autonomous boats?