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Submarine | Definition, History, Types, Characteristics, & Facts
Submarine - Wikipedia
Stuck on the puzzle (intro) - Alex Turner (Submarine Soundtrack)
Submarine (2010) Opening sequence - YouTube
How Submarines Work - HowStuffWorks
submarine summary | Britannica
How do submarines work? - Explain that Stuff
submarine - Students | Britannica Kids | Homework Help
Submarine - Encyclopedia.com
Submarine Development, A Short History - NHHC