It looks to me that the aim is to get through the magnetically sealed grate in the back of the server room.

getting the night vision goggles from the storage room, and cutting the power,

Go to last cell on left and open drawers under bed. There is a bit of iron there, take it. Use the access card you created from the drink label on the door and open it. Enter new room. Behind the computers on the right, there is something that you can move heavy stuff with. Take it and use it on the big server next to the entrance (behind you). Look at the floor, see the round patches and use that bit of iron from the cell on it. Now go up the stairs at the other end of the room and find a fire extinguisher hidden behind some computer screens. Take it and use it on the iron thingy. The floor cracks. Now move the server on top of the broken floor and the floor will break even further. Move the server out of the way, use C-button to crouch and jump in.
Look towards the prison you came from and go forward. Take the first right, right again, go left, right, left, right (may have to look up and down to see the exit a few times) and click on the grill to open it. Use the C-button again to stand up. Find the locker and take the loose shelf. Now go to the toilets, there is a storeroom here. Open the drawer of the desk and take the cutter. Stand on the stairs next to the locker and use the cutter on the box, take the nightvision goggles. Finally the locker itself. Use the wrapper with the zigzagline on the lock to see which buttons to press. Inside you find an envelope that contains all your stuff.
Exit the storeroom and go to the server room. Go down with the elevator and find two chairs on wheels. One is in the first office on the left. Grab it and roll it back to the elevator. Another office on the right has a chair on wheels as well, grab that too. Now go back up again and move the chairs to the reactor room one by one.
Use the shelf you found on the yellow wall underneath the reactor and climb it (or place the chairs next to it and climb them) so that you can reach the two switches on the reactor. As soon as you turn one, it will get dark, but if you grabbed the nightvision goggles you will put them on automatically. Now use the fire extinguisher on the reactor and Nick will say it's cooled off a bit. Place the chairs left and right from the lower end of the shelf until they are stuck. Click on the reactor and it will slide down onto the chairs. Now grab the chairs with the reactor and take them to the elevator and go down. Now the magnetic lock is switched off and you can escape through it. Go to the second opening on the left and end up in a new location.

well...actually, in the maze of sewers under the station.

There is a few things you need to do to find your way into the sewers. There is a box in the hangar that you need to move and drop somewhere. There is a box in the upper part of the crane area that needs to be sent down to the crane area.

you don't. Have you tried to climb over it? Save before you do just in case

was some power panel somewhere for the round elevator and the other force fields but can't find anything,