And then there were those of us who put baking soda inside the subs in our bathtubs .... But that story is for another day.
I think the game modded to TMO as I have set forth above is friggin' impossible. Typical scenario: contact at 250 degrees, long range; Search radar screen for contacts using 32K yd. scope--no contacts blips within radar range; 5 minutes later blip spotted on radar and crew announces "aircraft spotted;" Order boat to dive to periscope depth; Plane attacks; Plane departs; Surface the boat.
This repeats itself several times as the sky is crawling with planes. Radar is now my good friend, for without it, my boat is going down.
When I spot a TF/convoy the escorts are ready to pounce.
It takes a long time to run a mission, and I haven't completed one yet. Currently, I am off the coast of Japan, have sunk one merchant, fired on a fishing boat, been damaged by air attacks twice, and sunk (and replayed the mission*) once.
* trying to sneak into Tokyo Bay when your battery is low is not a good idea, I was unfortunate to discover.