once you get into the lift it takes you down into the control center,you need to get past
a couple of guards down there,then there is a civillian in the control room,you need to
grab him![dont kill him]move him to the computer get him to raise the submarine.
once thats done you can knock him out and hide his body,then move out of the control room
to enter the submarine pen!theres guards up on the gantrys and in the far end stairwells
left and right,take those out and make your way down to the submarine.once you get there
the hatch is open,enter then follow your next objectives inside the submarine.

seems to be just a bug in the game...my comps up to date....and ive had issues getting the
teachnician to raise the sub.