The highlight of the show was the sulphur mine explosion and eruption of volcano Mount Stomboli. In April 1906 Collins and Caine had gone on a research trip to Sicilly where they spent a day with Leone Testa, the inspector-general of Sicily's sulphur mines. In one mine which Caine and Collins visited there were 730 steps from the bottom of the mine to the surface. Testa recommended Caine took Collins to the sulfotara near Naples. While in Naples they witnessed Mount Vesuvius erupt. Testa visited London and after seeing the play he commented that In combining the two for dramatic purpose, Mr Collins has attained a better scenic effect than could be got out of either alone. His scheme is justified by the result, which is the most gorgeous I have ever seen on the stage The opening effects of the scene, with the line of carusi, or sulphur burners, carrying the sulphur blocks, seem to me very effective. The blue, pulsating lights from the calcarone in which the sulphur is being burned are most realistic and wonderful.