Hello.
I’ve (probably) found a bug on the map “Breakdown” by bmFbr.
On the way to the reactor core there is a gravity lift.
If instead of jumping right into it when it opens I just peek inside and back down it closes again with an impassable transparent red wall rendering both gravity lift shafts inaccessible again.
I had to use noclip command in order to progress forward.
Although it may be just me being a dummy and not finding a proper way to progress forward.
I don’t know where the key is, but note that you should play alk1.2.zip (version 1.2 - has some changes and new maps) instead of alkaline.zip (version 1.0).