I guess I should have said ' Whats really going on here ?"
I am not going to push at the door - I'm happy to accept what we think we know :-
''Tacos at Two Hundred Feet '' Neal Stevens. -
http://www.subsim.com/ssr/ssr713.html
Formal definition:-
"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.''