The monitor was not a submarine. It was just a boat that did not have much freeboard.
Well duh - how could it have any Free Board at all when it would be generations before any member of Lynyrd Skynyrd was even born?
It’s fascinating that American (both sides of the M/D line) technology and manufacturing was that innovative, that long ago.
Let’s stop sending those abilities to other countries.
Make America that great. Again.