Redemption - The Underwater Station
In a moment, you’ll be underwater and outside the station. Swim forward with your team and go through the marked hatch to enter the transmission center. Climb up and join up with Hudson. Open fire on the first group of soldiers inside after he opens the door. Help your team clear out the first room. They should be pretty effective, so just mop up any stubborn survivors and move foreward
Move up and wait by the entrance. Engage the first few soldiers and then curve inside and get behind a crate. The submarine should fall in a moment. Once it hits and the water clears away, open fire and clear the room. Watch out for a few armored soldiers that will come in through the back door. Your submachine gun should be able to take them out with a burst to the legs and torso, so don't worry too much about headshots.
Follow the marker and Hudson up into the corridors. Keep your finger on the trigger and shoot through the series of guards. Enter the next big room and shoot a few of the closest guards. As you advance into the room, a direct hit will breach the station and flood the room. When you regain control, just follow Hudson to the catwalk and climb back out. Follow him through the corridors and kill a few more surviving soldiers. I believe that you should make it to a big weapon cache at this point. If you're low on ammo or want a new gun, trade out. We've got a little bit more fighting to go. If you're low on ammo, definitely trade out.
Follow the corridor into the large control room. Watch the left side of the area. The soldiers seem to like sticking to the corner of the platform. Use the doorway for cover and pick them off. Once the platform is clear, run around it through the water until you come out at the end.
We're almost done. Follow Hudson up to the final area. There should just be a few armored guards protecting the actual transmission center. Aim for their heads and watch out for an extra guard that usually hides behind one of the walls. You should be able to knife him repeatedly, if he manages to ambush you.
The soldiers working the panels are distracted, but they will turn around and attack if you get near them. Don't try to knife them, just shoot them from a short distance away. Use the context key to stop the transmission and save the day. This will trigger the final confrontation with Dragovich. Use the context key to pull Dragovich down to the lower level, then hit the appropriate keys repeatedly to drown him. Once he stops breathing, get back up and follow Hudson down the corridor to the exit.
Everything that follows is just the ending cutscene, so sit back and enjoy.
Congratulations, you just completed Call of Duty: Black Ops.