On the coast near a place called Breiwick, The Quilse, there is a heap of strange tubes. These are from the local salmon farm.
They make huge loops in landscape.
These black tubes seem to be indestructible. People find all sorts of uses for them: fence posts, cattle grids, boat slipways. I imagine they would make rather fine musical instruments. I have never heard of anyone using them for this.
But their primary use is to create the salmon cages that float out on the shallow seas in the area.
I saw these tubes on a walk from the Historic Site. I’ve drawn in this location before. In this sketch, you see the black tubes as the small scratchy lines in the centre distance.