He saw how it worked now, the clear plastic pipe running from a box in the wall to the mask.

Then feed the other end of the rope through a length of plastic pipe.

One question remains: what kind of musician would want to give up his instrument to play a common piece of plastic pipe?

These generally consist of either a plastic pipe or a specially stiffened jib, and a spool to hold the furling line.

Plastic pipe doesn't corrode in damp earth, as metal ducts can.