The most important work of the Planu Sartu Mine is undoubtedly the “Galleria Henry”. It was mined in 1865 and enabled the transport of minerals by means of a rail from the underground yards to the distant washing plants.
It is situated 50 mt. above sea level, above the built-up area of Buggerru, and crosses for about 1 km the Planu Sartu tableland.
The gallery is a kind of picturesque labyrinth: it was made secure and provided with signs, so that now it is accessible in absolute safety. Its singularity is determined by the fact that there is a constant connection with the cliff over the sea through smaller galleries and paths carved, like ideal windows, in the rock.
Through these bright openings, which alternate with the underground dark, it is possible to enjoy a picturesque view of the coast falling sheer to the sea and of a stunning panorama.