Figure. [A] Top view of the underground system, a reservoir of reused water of the Faculdade de Saúde Pública of the Universidade de São Paulo (FSP-USP), Aedes aegypti breeding ground where 158 adults were found in March/2016; (1 and 3) lateral access chambers to the reservoir, (2) central access to the reservoir, (4) drain to collect rainwater, (5) window of the FSP-USP underground cafeteria, and (6) reservoir vent. [B] Detail of the central access to the reservoir (2) and of the entomological activities, collection with entomological shell and aspirator, carried out in this place. [C] Isometric view of the underground system. São Paulo, state of São Paulo, 2016.