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Did You Know? · before 3 h.

Manually ventilating a deep mine shaft using a plastic bag and a tube, an improvised way to force fresh air underground when there’s no mechanical fan.Did you know? 🎓

Manually ventilating a deep mine shaft using a plastic bag and a tube, an improvised way to force fresh air underground when there’s no mechanical fan.Did you know? 🎓
Manually ventilating a deep mine shaft using a plastic bag and a tube, an improvised way to force fresh air underground when there’s no mechanical fan.Did you know? 🎓

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