Death to Spies - Mission 2 "King's Riddle" Saboteur

[aGENT]

Ok, playing the saboteur difficulty in this game is a , I know. Still, having played all other levels successfully (wolfhound) they at least appear to have some sort of intended "line of play" (so to speak); meaning complete-the-mission-with-all-objectives-in-a-reasonable-amount-of-time line, making it somewhat surmountable.

Except "King's Riddle" it seems. Or more precisely, the docks area. How do you even move around in that place undisguised (or without killing just about everyone)?!!! And with only ONE way in to the sub? This is just ridiculous - or have I missed something? I even tried to go along some steal pipes in ceiling (which would had been cool if it had worked btw).

Anyway, how do you do this? And if you've chosen to go through the sewers how do you get back (or start the pump again)?