Thanks fellas !

Hi
Just starting out playing. My buddy are enjoying the heck out of it. We have a question regarding Destroyers and Subs.
Do friendly Destroyers make friendly Subs “visible” to the enemy ? My reading of the rules makes it sesm as if this is so. But that doesnt seem right and Im at a loss.
Since Im just an ol Grunt and clearly not the sharpest tool in the shed, I figured we’d consult with some subject matter experts.
Thanks
Joe