[central_va]

It wasn't a simulated trans-Atlantic attack. The French sub was part of the exercise and already on station.

Exactly. A CVBG doesn't go into an area with known bad guys subs in a real war scenario. The hostile Sub would be tracked and probably sunk in transit long before it became a threat to the CVBG. A CVBG only goes into sanitized waters. If you cannot tell the CVBG where the bad guys are then they don't go into a high probability area unless the mission is really worth the risk.

[Drew68]

A CVBG doesn't go into an area with known bad guys subs in a real war scenario. The hostile Sub would be tracked and probably sunk in transit long before it became a threat to the CVBG. A CVBG only goes into sanitized waters.

"Sanitized" waters aren't always sanitized. Of this, I can assure you.