Steam: Bollocks to Plan B!! here. Recently, the 90 degree corridor corner marked by the cursor was damaged by a dust devil. I've since repaired it (still some panels missing inside), however the airlock from the HAB to the corridor reports the pressure of 7hpa. Since i'm now expanding into this section of my base, I thought the best thing to do would be to grind it down and replace it. Doing so, however, results in the entire base dissappearing except for the corridor beyond the 90 degree corner. I will do so and add the screenshot to the next report.
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