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How do submarines work? - Explain that Stuff
How Submarines Work - HowStuffWorks
Diving and Surfacing - How Submarines Work | HowStuffWorks
Submarine - Wikipedia
How Does a Submarine Work? - Wonderopolis
Living Underwater: How Submarines Work - YouTube
Submarine | Definition, History, Types, Characteristics, & Facts ...
A Quick Dive Into How Submarines Work : Short Wave - NPR
How Does A Submarine Dive, Resurface And Navigate Underwater?
How Do Submarines Dive and Surface? - YouTube