The tunnel and research facilty.

Secret entrance under the bed in barracks '2B'. Activate it to open.

The bed again, now open.

An other secret entrance under the heater in barracks '1A'. Activate to open.

The heater, now open.

Main room in tunnel.
Ladder goes to heater in barracks '1A'.
Tunnel infront goes to research facility.
Behind me is the tunnel from barracks '2B'.

Tunnel leads into research fac.

Entrance to airvent. Shoot grating. Jump and crouch to get in.

Inside the vent. Ladder goes to two gratings (see below).
Straight ahead and then east to go to labs 3 and 4 (see below).

After entering the research fac. from the tunnel and bypassing the vent, you reach this room.
To the left is a door.

Through the door is this corridor.
To the left are labs 1 and 2.
To the right is the elevator to the surface.

Through the door on the left.
The stairs down lead to level two of the facility.
Through the door ahead is a control room (for lack of a better term i call it this :) ).
On the other side are labs 1 and 2.

The elevator to the surface.
To the left are the 'corner of many pipes' and labs 1 and 2.
The grating is one of the exits from the vent when going up the ladder.

The 'corner of many pipes'.
Through here to labs 1 and 2.

This is the other grating reachable from the vents when gone up the ladder.

After the corner you end up on the other side of the controlroom.
To the left is the door to the 'corner of many pipes'.
To the right are labs 1 and 2.

Labs 1 and 2.
Documents can appear here.

Inside lab 1.
The door in the back goes to lab 2.

Inside lab 2.

When you go on from labs 1 and 2 you end up here.
The big door in the middle goes to the supersoldier-room.
The door in the back goes to the stairs next to the control room.

Inside the supersoldier-room.
On the second floor in the back is the controlpanel.
Below it are passageways.

Next to the big door are ladders.

Go up the ladder and to the end.
If you brought the key, use it here.

The passageways in the back of the supersoldier-room (left-side).

And the right side.

The door on the left leads to the supersoldier-room (through the passageways).
The elevator on the right goes to all 3 levels of the facility.

Select the level you want to go to on this panel in the elevator.

Labs 3 and 4 are on level 3.
On the right side is the elevator.
Forwards are labs 3 and 4.

Inside lab 3.
If you go through the vents (not using the ladder), you come out here.
Documents can appear here.

Inside lab 4.
And the last exit from the airvents.
Documents can appear here.