Death To Spies: Moment Of Truth (Saboteur Mode Walkthrough Help)

[Zucheero]

Hi to all the lovely fans of DTS series,

I'm stuck in the second stage "Riddle King" and I've been playing in the "Saboteur" mode which means I cannot stun/use chloroform on the Nazis and use their uniforms. So I've managed to reached the Submarine and I've also stolen the Enigma and done with all the other objectives. Now I need to get out. I'm stuck really bad and just can't seem to find break or a flaw in the patrolling of the Nazi soldiers in order to get away without raising an alarm or attracting unwanted attention. Has anybody played this game on "Saboteur" difficulty ? Could you suggest me options or methods to get past and reach the drop point. I have a really good rating till this point in the stage with just 3 kills and one guy chloroformed. Anybody out there whose done it or would like to suggest me anything please lemme know. Thanks so much.

Happy Killing The Spies,
Zucheero