It is empty.
Real submarines patrolled for maybe 60 days.
The game breaks the war into segments. The first is from dec 41 til February 42. The next is march to august, and so forth.
The game ONLY LOADS TRAFFIC BASED ON YOUR PATROL START DATE.
So if you start in january 42, when the dec-feb traffic puts into port, that's it, no more traffic, not ever. There is a little slop set, so that if you start at some point in jan/feb, you will also see the spring traffic at the same time.
Go home, dock, start a new patrol.
This "refit" and go get more tonnage nonsense is what causes this.
tater
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