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Except for the bit where you can't see a thing.
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Great idea to use something like that in a tunnel or a garage. Suffocation - no breathing ... and probably some blown doors/walls from the pressure
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How are you going to suffocate when the thrusters are sending out compressed air?
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Car tunnels should be able to handle that level of bad gasses.
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What bad gases? It is literally air. Do you see a lot of mechanics passing out in garages with all that compressed air being let loose?
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