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This is an unmanned device so it doesn't have the same safety concern. Also at the cruising altitude there is so little oxygen it's probably as safe as helium a
by graz 4y ago
This is an unmanned device so it doesn't have the same safety concern. Also at the cruising altitude there is so little oxygen it's probably as safe as helium at that altitude.
- cmeacham98 4y agoSorry, maybe it wasn't obvious enough the first part of my comment was intended as a joke?