ELI5 Submarines - how the Titanic was a cover for a US Navy submarine mission

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

If nuclear submarines can generate their own water and oxygen underwater, why do they need to surface at all? Why are submarine propellers always at the back, while airplane propellers are usually at the front? How did submarines and the US Navy play a part in the discovery of the Titanic?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: ilearnrussian, lokiorin, slobbie, hemingwavy, yancy_farnesworth, luckbot, omnipotentsandwich, r3dm0nk.

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