[Drew68]

I see the US didn’t have a fast-attack sub on station for this excercize - French sub would have gone down without even a whimper.

The TR Battle Group had a sub.

[central_va]

So how does this attack sub get from France to the Fla coast? It transited at 25 knots underwater for about a week. During that week it screamed along broad casting its position. Now in this exercise the sub started out a few miles away creeping along at slow undetectable speed. Not realistic.

[Psalm 73]

"The TR Battle Group had a sub."

Always does - but it wasn't part of that "game" scenario or the French sub would never have gotten in range.
(I cannot beleive that a French sub could out-fox even an older Los Angeles-class attack sub).