I destroyed one of the walls on the staircase and walked above the ceiling of the bunker, turns out, the undergound isn't filled with anything, its just an empty void where basements are the only constructions and hitboxes.  On another note, generators power things 2 levels up and 2 levels down, so: POWER POWER GENERATOR POWER POWER   Fumes only go upwards, and they do disipate. It takes  a day or two. So   FUMES / NO POWER FUMES / POWER FUMES / POWER GENERATOR POWER POWER -X- Think of it as hot gases going upwards untill reaching open air

My walls modified in an original tile sheet, it's murderous: meurtriere1.tiles                                                             PS: I couldn't find a dedicated tile channel, so I'm posting this here.

Version: [42.7.0] Mode: [Singleplayer] Server settings: [N/A] Mods: [Authentic Z, Condition On Dash, Draw on The Map, First Aid VHS Tapes, Generator Range, Item Condition, Map Legend UI, Proximity Inventory B42, Rain Cleans Blood Reorder Containers, Reorder The Hotbar, Smarter Storage, Smoking Sounds Overhaul, Spongie's Clothing [B42], Vanilla Gear Expanded, Vanilla Vehicles Animated, [B42] Generator Time Remaining, Brandenburg, Ekron and Irvington Spawn Locations, Has Been Read, Small Town Spawn Locations, Detailed Descriptions for Occupations and Traits, Farming Expansion B42(Trees), Long Term Preservation, Reload All Magazines, Serving plates for Build 42, What can I craft??, [B42] Useful Barrels, Ladders!? (v0.0.13)] Save: [New Save/Old Save] Reproduction steps: 1. Walk into corner flower tile at 3337, 14579, 0 at Irvington outskirts. 2. Fall infinitely in air through world without ever landing (Note: You can see from inside the house a missing ground tile around that area and the adjacent flower tile. Probably this.))

Version: [42.7.0] Mode: [Singleplayer] Server settings: [N/A] Mods: [None] Save: [New Save] Reproduction steps: 1. Start the game in Sandbox mode. 2. Turn Muscle Strain factor to 0.0 3. Play the game - muscle strain still exists. I know it may seem simple, but that's genuinely all I've got. It's definitely, checked and double-checked, set to 0.0 I've tried starting new saves and setting it to 0.0 again. It absolutely will not turn off for some reason. I even tried downloading the "remove muscle strain" mod. Absolutely nothing works - that muscle strain will not leave. And yes, it's definitely muscle strain, so says the "health" and treatment panel. :(

I think you're missing out on the greater philosophical implications of it all. It isn't too too difficult to make a self sufficient base far away from any zombies, but it isn't very exciting. Then, if you make a base near the cities were it's more dangerous, it becomes, well, much more dangerous, while still being more exciting. The sort of Last Man on Earth, Night Eats the World sense of ennui that comes with a good end game base isn't something you see many zombie games explore.