Why eat ramen noodles
Why not?

Seriously, what would a ninja do on a submarine. First why would he end up there, we're not sure to have an answer. But ninjas end up in a lot of places while looking for new kind of ramen dishes or simply chasing a supervilain that just destroyed your favorite bicycle. So, ninjas could end up in a submarine, that's possible, but we're still not sure what they would do once they get there.

But wait!

We think we might have an answer to what a ninja would do in a submarine! After taking control of the submarine with his amazing ninja skills, he would probably look for the nuclear reactor in order to try a brand new way of cooking his ramen noodles!

But wait again!

We have to warn you the 0.000000000001% of you readers that will some day end up on a nuclear submarine to not try this! We repeat.. do not try this! This may overcook your ramen noodles and you will have nothing left to eat!