The snorkel. Possibly the best bit of kit your boat can have. Raising this will allow you to run your diesel engines whilst submurged. And yes it will also give the crew fresh air.
Wooden "Triangle thingy", sounds like you now have a radar detector, alerting you to the presense of radar equiped allied vessels and aircraft.
Can't help you with the single missions I only play careers, sorry.
Nice black and tan wolf by the way, she looks very similar to mine.
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Sir Humphey Appleby, GCB, KBE, MVO and MA. Britain's Greatest Orator, well bar that Churchill fellow.
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