Yeah, I noticed when I tried the second tutorial mission. That mechanic worked out great!

My first attempt at the second mission I had the periscope up too much and forgot to dive so the escort vessel rammed me. Maybe tell the player to pay attention to the detection-o-meter?

Second time I was very careful and managed to get hits with four torpedoes on the first salvo. I had to bring up the scope to watch. I had no expectation of even getting close so it was INCREDIBLY satisfying. Then at first it seemed like I'd escape but I lost track of the escort and then got blown up by depth charges.

I'm absolutel going to try again, though. This was a lot of fun.