In trench B1, a vast area of US 104 (a clast layer rich in micro-fauna) was investigated. At its base an attempt was made to further clarify the transition to the underlying layer (US 105), also rich in macro-fauna (including two, almost complete skeletons of Canis Lupus and Rupicapra Rupicapra found during the 2014 and 2011 campaigns).
The excavations revealed the presence of US 317, and “interface” between US 104 and US 105, with its own characteristics. Numerous micro-faunal remains came to light during the excavation of US 104.

Once this was finished the underlying level was excavated, which was not US 105 but a mixed layer with the characteristics of both US 104 (loose soil and micro-fauna) and US 105 (macro-fauna and large clasts). Therefore, this level was denominated 317. Also in trench B1, the investigation of US 109 in quadrants d-e 7-8-9-10 was renewed. In order to avoid leaving difference in height with the adjacent quadrants the excavation reached the underlying levels. Various types of macro-faunal remains, a flint backed blade, and charcoal lumps were found. This evidence indicates that, in this sector, US 109 deepens following the natural lowering of the base floor. These patches of occupation level US 109 will be examined further during the next campaign.

In trench B2, work concentrated on the excavation of US 318 characterised by the presence of Pleistocene fauna dating to just before 40 Kyr BP (the wolf skull found in 2010 has been dated to >43500 BP). The level was uniform, consisting of a clayey layer containing occasional clasts over one centimeter in size, with rare faunal remains (especially wolf and hare). The excavations went down to -345 below site 0. At the edges, the stalagmitic crust continued to emerge that constituted the base on which this clay level formed. The excavation of the stalagmitic crust will be completed during the next campaign. In trench B3, the investigation of US 325, identified during the 2014-16 excavations, continued. This was the deepest level investigated to date and produced a very small number of small mammal (hare) remains. The level was heavily concretionary, and the excavation was undertaken in collaboration with the Shaka Zulu Speleo Club di Subiaco, technical partner for speleological excavation in the caves.

In trench C, a residual patch of a Neolithic level (US 283), constituted by medium sized clasts and identified in 2016, was excavated. The investigation also revealed overlying residual patches of a Bronze Age level, US 165. Therefore, it was decided to excavate the entire area of US 165 and the underlying crusts (US 264), which obliterated US 283, postponing the excavation of the Neolithic level until next year.