Also... if you have NO torps left, at all... then the only thing left to remedy that in particular... is to:
A. Hit up a milk cow uboat, or a docked ship that is set up for resupply duty, if you are in the assigned time frame that such resources are available.
This can be one through what is commonly referred to, as... pseudo docking... getting to where either of these resupply boats are located in the time frame that they are slated as 'available'... then instead of actually docking... I believe it was to select 'continue', thereby activating getting resupplied... again, dependent on what mod set you are running with, depends on just how much of a resupply is afforded you... at that time.
Some mod sets only allow for this to be done once... others, redo able, dependent on a 2-week window... meaning that you have to wait 2 weeks before returning to that resupply spot to do a resupply.
Or...
B. Doing a Return to Base... & docking, thereby... ending your patrol.
Useful, if besides resupplying your sub, it gives you time... to have any damages done during patrol that are NOT repairable, while you are out on patrol... repaired.
M. M.