https://en.wikipedia.org/wiki/Submarine
History
http://www.submarine-history.com/
Entertainment
http://www.submarine.nl/
http://www.submarinechannel.com/
Cable
http://www.cablemap.info/
http://www.submarinecablemap.com/
Global
http://globalsubdive.com/
Tri
http://tritonsubs.com/
Cayman
https://www.caymanislandssubmarines.com/
Tube
https://www.youtube.com/results?search_query=Submarine
Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Submarine
History
http://www.submarine-history.com/
Entertainment
http://www.submarine.nl/
http://www.submarinechannel.com/
Cable
http://www.cablemap.info/
http://www.submarinecablemap.com/
Global
http://globalsubdive.com/
Tri
http://tritonsubs.com/
Cayman
https://www.caymanislandssubmarines.com/
Tube
https://www.youtube.com/results?search_query=Submarine
Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Submarine