So sorry to hear about your husband, Adorable. Our best wishes to you and your family.
Did you manage to open Crille's box at Harri's apartment? The information is in one of the documents there, and it will put a new location on the map (Aviation Administration). There are a couple of keys in the box, too.
Then, from MaG's walkthrough:
Jump to the Aviation Administration. Check the door and see that it is locked.
Go left and follow the directional arrows. Turn left at park after the steps and lamp post.
Follow the directional arrows again. After climbing the stone steps, turn right and read the poster on a red stand.
Learn about the Air Force bunker and the main entrance at south side of the mountain.
Go back down to the right until the paved path. Go forward until the "exit"; then turn left to see the bunker's main entrance.
Go to the gate and use the Crille key on the padlock.
Enter the bunker and use the miniflashlight taken from Carol's office on the dark room.
Turn left and turn the wheel to open the door.
Enter the first room at left. Turn left and move the #2 brick. Take the bunker map.
You can follow your location in the map. Exit room.
Turn left on main hallway and forward until the rusty door at the end.
Enter the room at right.
and let us know if you still have problems.