There\'s a dead soldier on the floor in front of the door? Maybe you\'re palying a different map than me.
In mine (from memory) the first level was 1 room. There are 4 walls: A computer graph terminal screen/wall, a blank wall, a latch door (with a green and red button), and another blank wall. You go up to the green and red button (the red one should be currently lit), and the press the \"use\" key (whichever it is... it depends on your perosnal keyboard mapping). On mine I think it was the space. You can tell if your using the right key because if you\'re in front of a wall, and you press it, the guy grunts (because he\'s pushing the wall).