<I recall seeing a TV programme about AHB. The beekeeper opened a hive
<while wearing a mask with a pipe of several meters long to remove his
<breath away from the hive.

Besides looking silly, one must be careful breathing through a pipe
'several meters' long. Depending on the diameter of the pipe (and
therefore the volume of air it can hold), one could be breathing the
recently exhaled air from the previous breaths. It would be unfortunate to
pass out on top of an open hive of AHB's because of lack of oxygen!

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