. 13 January – 11h00 (Tour in english)
. 20 January – 16h00 (Tour in english)
. 27 January – 11h00 - 16h00 (Tour in english)
. 10 February – 11H00 (Tour in english)
. 24 February – 1h00 – 16h00 (Tour in english)

Underground route through one of the galleries of the Águas Livres Aqueduct starting at the Mãe d'Água das Amoreiras reservoir and ending at the Patriarcal Reservoir in Jardim do Príncipe Real.
Cost: 6€
Not recomemend under 6 years old 
Duration: 60 min
Meeting point: Reservatório da Patriarcal, Jardim do Príncipe Real, Lisboa 
Final exit: Reservatório da Mãe d’Água das Amoreiras, Praça das Amoreiras, 10, Lisboa.
Recommendations: The use of closed and comfortable shoes is recommended. Not recommended for people with claustrophobia and under 6 years old.