Need passages versions and other inside blocks with floors for placing over non-airtight blocks.
Exactly ! So you wouldn't need to build around these to make airtight hallway !
+1, never understood why they didn't have floors to start with really- this is the one time they should have directly ripped off the Passage ways mod pack that adds way more options and variants for people to build with- and not lock the most important ones behind DLC...
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