Thanks to DarkUFO reader RangerRebel for the following.
Went to Pearl Harbor this morning and saw the crew setting up at the USS Bowfin. We talked to one of the guys and he said they will be filming inside the submarine starting at 4pm local time today. In the pic you can see the cables running along the right side of the sidewalk down towards the sub.
Source: RangerRebel@DarkUFO