> still be good enough in terms of safety when pressure is lost? You might not design for that case. A suspension bridge can't survive a tower falling over,

> still be good enough in terms of safety when pressure is lost? You might not design for that case. A suspension bridge can't survive a tower falling over, or a cable snapping. The pressurized structures wouldn't be able to survive leaks over X size, and for leaks under X size, compressors would be used to maintain pressure.