Youtube of USS South Dakota's Trials

Published on Youtube a few days ago, January 4, 2019. Filmed on November 27, 2018.  (Film Credits courtesy  SSG Alexander C Henninger and SrA Jared Bunn via Gung Ho Vids )

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.  South Dakota is the seventeenth Virginia-class submarine to join the USN.

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. 

South Dakota is a Block III Virginia. see on List. At Wikipedia:

Propulsion: S9G reactor 40,000 shp (30 MW), Test depth: +800 ft (240 m), 

Displacement: 7,900 metric tonnes.

Pete