MOSAIC second review meeting was held on 4th and 5th September 2019 at CENER premises in Sarriguren (Spain). The first day was dedicated to the preparation of all the presentations for the official Review meeting. The second day was dedicated to the official Review meeting with MOSAIC Project officer Bernardo Abello, where the Consortium presented the status of the project. Furthermore, we visited in the afternoon the Sangüesa CENER facilities where the excavation to install the MOSAIC prototype has been started. Our thanks go to CENER for the excellent meeting organisation and for the preparation of this successful meeting!