Published on Youtube a few days ago, January 4, 2019. Filmed on November 27, 2018.
Above is exterior and interior footage of the Pre Commissioning Unit (PCU)
South Dakota(SSN-790), and a dive manoeuvre sequence from the control room.
36 seconds in - walking through a narrow cental corridor
56s - large by submarine standards galley. Where the crew seems to be hanging out, off duty.
Not hanging out in the torpedo room like in old SSKs.
1m 11s - bunks are still cramped
1:39 - senior petty or officer in control room declaring trial operating-diving
1:47 - while on surface submarine is operating in 2,500m water “beneth the keel”.
1:56 - submarine will submerge to "155 feet" = 47m
2:24 - diving
3:00 - famous dolphin "fish" pin.
BACKGOUND
USS South Dakota (SSN-790) will be commissioned at Naval Submarine Base New London in Groton, Connecticut on February 2, 2019.
Displacement: 7,900 metric tonnes.
Pete