Objective 3: (5)

First things first, change your weapon to the silencer and then holster it. You might be asking why, but trust me – the next guard you need to take down requires you to be silent. We don't want to get spotted while fumbling for the right gun, right?

Head back down the hallway to the middle level and take the stairs down to the lower level. Before you enter the next room, hang back and wait for a soldier to walk out and move to the side. If he spots you, he'll give away your position, and we definitely don't want that.

Once he's moved, slip into the next room undetected. Move past the supplies and head for the open door.

Inside, you'll find a hallway. Walk down it until you see another door. Open it, and you'll be outside on a walkway.

Walk down this walkway, past the barrels. You'll see a guard patrolling the area. When you reach him, he'll ask for your papers. Press 7 to show them to him.

Continue down the walkway to a more open area. Turn north, and you'll see stairs with a guard standing by them. Head up the stairs and into the room.

Get your gun out here and take down the soldier. Grab the papers from the table and then holster your weapon.

Now, head back down the stairs to the soldier you showed papers to earlier. He'll ask for them again. Show him the papers you just picked up.

As you might have guessed, these papers are fake and will cause a bit of a stir. Walk past him and head towards an almost identical dock. You'll see a U-boat there – that's our target.

Walk west down the walkway until you reach the one leading to the U-boat. Go down this walkway and board the boat.

Once on the U-boat, head west again to find a ladder. Climb up and go inside through the trap door.