Hey, thanks for the message,

For the 2nd massive hallway door, there are two intended ways to get across to the terminal across the hallway:

1. Use the MSSIRT's crane as a moving platform, where you can stand on the fix tool as you gently move the crane
2. Doubling back through the 2nd room of robots, going through some smaller maintenance shafts up, up, up then through the bridge, and then down and around - if you find a robot leaning against a door which leads into an empty warehouse, you want to turn around, go right, and find another room with a small ramp up to the hallway. If you look up to the ceiling there should be a thin black line dotted along the ceiling leading to it.

For reference here's a rough map of the two paths:

Hope that helps, if not I can record a video walkthrough.

- Peter