alt Hacker NewsThe Tube has a real ventilation issue - not just the brake dust, but also temps and staleness. Some of those lines, it’s like a 24/7 sauna!
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porjo • yesterday at 9:13 AM
Ha, I happened upon an interesting video earlier today on this topic! https://youtu.be/4MzHt_YLnjw
I think I read that the warmth from people and braking has baked some of the clay earth around the tunnels, making them even more insulative!