There was a certain amount of dramatic license here, but submarines did often do recon, etc., including weather info. Bombing raids were more accurate if they had advance info on things such as temperature, humidity and prevailing winds, as well as the various locations of specific targets (ships, buildings/facilities, barrage balloons, etc.). And in some cases subs knew in advance about raids for which they might have to do lifeguard duty (rescuing downed pilots), so they had to get into position ahead of time if possible.
Here are some of the typical types of sub mission:
-Anti-Submarine Warfare (detecting and destroying hostile submarines)
-Anti-Surface Warfare (detecting and destroying hostile surface ships)
-Landing Special Operations Forces (performing covert infiltration of hostile regions by commando forces)
-Search and Rescue (rescuing aviators shot down over the ocean or special operations forces stranded near the ocean)
-Intelligence, Surveillance, and Reconnaissance (listening for hostile actions, electronic communications and information)
-Battle Group Support (providing intelligence and undersea protection for aircraft carriers and their escort ships)
-Mine Warfare (laying minefields to deny ocean areas to hostile forces)
-Transportation of personnel and cargo (covertly moving critical forces and supplies)
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