Submarine

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