2021 - although this article isn't?! Discussions at the time:

USS Connecticut (SSN 22) struck an object while submerged on Oct. 2 (167 points, 173 comments) https://news.ycombinator.com/item?id=28792804

Top officers of a Navy nuclear sub have lost their jobs over undersea collision (68 points, 129 comments) https://news.ycombinator.com/item?id=29117277

I can't even figure out what's going on, this article is so chaotic with so much advertising and bad writing.