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In the upstream, is contained in the eruptive fissure and has a cross section as a lock with a height of several meters and no wider than 3 m. Once the openings are observed. The downstream section is instead a tunnel slide, very steep, long 350 m wide, 2 to 3 meters with the floor consisting of lava scoriaceous. Thefirst section of the walls are opaque but still have a further look glassy .