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"Angles and Dangles" is a submariners' term for a critical exercise that usually takes place right after a nuclear submarine leaves on a patrol. Once in deep water, the sub dives deep and then comes back up, both at a steep angle. Anything that is not properly secured will fall down, making some noise. These are known as dangles, and they must be corrected before a sub is fully rigged for silent running. Basically, you dive deep, come up steep, and listen to the result. In no way should this exercise be considered as "showing off" and is not usually something experienced bye the eyes of the public.
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