My dad was in the Navy (submariner) in the 80s and he loves that movie. He told me they didn't do the thing with the string like they do in the movie ... Instead they strung it up when they were at depth and took bets on when it would break on the way back up.
You couldn't pay me enough to be that far underwater.
I've used free tax USA for years. I don't pay for filing my fed, just my state. But my taxes tend to be pretty simple, so I guess ymmv