A series of maneuvers which a submarine crew exercises to prove their readiness for sea. The intent is to verify proper stowage of all items. Shortly after deployment, once a submarine has reached deep water, this exercise is performed and the sub repeatedly dives and rises at increasingly steeper angles. If an item is improperly stowed it will shift (or dangle) and generate noise. Since silence is of utmost importance during a submarine's mission these maneuvers are often performed during inspections to show high ranking officers that the crew has the appropriate concern for the Ship's mission. On rare occasions these maneuvers are performed for spectators (or riders), and in this case they serve a dual purpose; still proving a ships readiness for sea, but also demonstrating the capabilities of these magnificent warships.
Pot and pans, in the ship's galley, could be heard clanking by sonar during angles and dangles, indicating that the cooks were not properly prepared for a silent mission.
"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.
"Angles and Dangles" is a term used by submariners for the critical manuevers that usually takes place soon after the nuclear submarine has left port. Once the sub has reached deep water, the sub is put through "angles" or alternating deep, steep dives and steep climb outs. During "angles" anything that is not properly secured will shake, rattle, fall, etc. and make some sort of noise. These items which shake loose are known as "dangles", and they must be corrected before the sub is fully considered as silent running. Basically, the sub dives deep and comes up steep repeatedly while listening for any sounds.
After the sub was put through angles and dangles many items were found to improperly secured, because many sounds were detected.