Walkthrough: Tubeway Torpedo
Objectives:
Open up the map and located the red arrow and proceed across the sewer walkway until you reach the opening which leads to the surface. Climb up the ladder, but be sure to check that the guards aren't patrolling directly over the manhole. Wait until the guard's back is facing you, then use whatever means of putting him into an unconscious state (I chose the silencer pistol, again). Take his clothes and drag him back to the manhole area, out of sight of the patrolling guard located in the north region. It's best to take him out as well, instead of trying to run around in a stealth--like fashion. Make your way around the crates and pick up the gear. Jump into the truck and crouch in the back out of the sight of any guards who may detect you. Shortly after reaching the next area, pull up the map and analyze the movements of the guards before jumping out. Wait until the pair of guards have their backs faced you and be sure that you're walking normally ? or else you'll be fired upon. Just don't get caught jumping out of the truck and you'll be fine.
Walk to the right and wait for the guard patrolling the alley, follow him on his way back. Make sure to kill him or you'll regret it later. Look through the keyhole and wait until the guard walking up the steps is away from you. It will be easier to access the elevator if you kill him (and since he's the only one in the area), it's almost impossible to mess up and become overwhelmed by other guards. Take the elevator to the first floor. A guard may be facing you (depending on the length of time it's taken you so far to reach this area). If he has his back to you, wait until he's out of sight of the guard sitting at the desk (so that he won't notice you killing the patrol guard with your silencer pistol).
Open your map and carefully study it. You'll note that path requires you to proceed throughout the upper region (the path is pretty easy to navigate, and there aren't many guards to take out). Walk through the door which leads back to the door marked "Warning". There's a green surveillance panel found here?shoot it to disable it. Now exit the way you came and head down the corridor. Stay clear of the patrol guard and cautiously dash past him to reach the second basement level.
There's one patrol guard which you absolutely must avoid and then dash past the door (which remains open at all times). If you're really good, you can kill him just as he exits the guardroom. However, this seems more like a gamble and the rate of detection felt random nearly every instance I pulled it off (I only acheived success a few times to be honest). My solution ended up with killing the patrol guard and his comrades in the guard room. Aggression at its finest. However, if you take this approach, chances are you'll be at risk of alerting the general. If this happens to be the case, the prisoner will have mere seconds before he's killed. Pick the lock and shoot through the glass to kill the general. Collect the combat knife (if you wish to add it to your collection). A short sequence between the prisoner and 47 will take place. Now the fun part is escaping. Exit the room and head back to the first basement level. Open your map and locate the designated area where you'll use the mini--bomb. In case you haven't done so already ? kill off the guard who is patrolling the entrance to the elevator. Head to the blast area, plant the bomb (in case you're uncertain of the distance, the game supplies cues indicating the approximate distance required to safely place the bomb, along with the required space you need to be away from the imminent explosion). Make sure that the general is safely behind you before triggering the explosion. Enter the sewer and proceed to the left, cross the bridge and head NE. Finally, head across the pathway and locate a metal door. The explosion will alert guards to your locations, so hopefully you've got enough health to defend yourself and complete the mission. If you've got the AK in your inventory, holster it and kill off all the guards.