Cool! I actually worked for a fast attack sub while in the Navy. The USS Archerfish (SSN 678), a Sturgeon class. She’s razorblades now, I think. USS Mississippi in the sub fleet. Awesome.
The fast attack sub has evolved over the years into submersible cruiser or capital ship. The Virginia-class embodies the best features of the sucessful Los Angeles and Sea Wolf classes. They are very fast and powerfully armed. It is vessels like this that will make the Chinese or Russian surface fleets into scrap metal.