|So, I am wondering whether sumbarines are used for any civilian applications or whether they are now an almost exclusive domain of the military.
The civilian applications I have read about so far:-
Science/Research/Exploration/Experimental... these generally survey the ocean currents or dive to deep oceanic trenches and carry out other scientific tasks.
Tourists - there are some sighteeing sumarines used to allow tourists to view marine life under water.
Personal submarines - I have read a report on a submarine 'yacht' being built for sale for millionaires. I don't think it is on sale yet.
Engineering Submarines - used to help build structures underwater, most usually these structures have to do with oil drilling.
Rescue Submarines - these are used for, well, rescues and in emergencies.
Well, the above is not much at all and it does not include any large submarines. Am I missing something?