Okabe Rintarou
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That this man is certified to be able to swim underwater to an enemy warship underway and by sheer force of muscle stop the propeller of the ship (or submarine). Its a very elite course taught in Israel. They are taught to hug the propeller and make the legs into a Y shape to increase drag and stop the propeller spin.
JK.
It means he is mechanical engineer certified for engine room.
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