Probably. Airliners are pressurized to around 0.8 atm when at cruising altitude. The atmospheric pressure around 0.26 atm, so there is a pressure difference of

Probably. Airliners are pressurized to around 0.8 atm when at cruising altitude. The atmospheric pressure around 0.26 atm, so there is a pressure difference of around 0.54 atm. That will cause a considerable outward force on the cabin which would result in a lot of tension. If you didn't pressurize the cabin than the cabin would be at around 0.26 atm, which is the same as the outside air, and so there would not be that large outward force, and so much less tension. But the plane should be fine with that, because that's also the situation in the plane at low altitude.