This paper presents the monitoring results of a 2.5 m diameter pressurized water supply tunnel (Water Tunnel) with segmental steel liners, subjected to ground movements caused by the excavation of a twin road tunnels crossing above the Water Tunnel with an excavation clearance of 7.5 m excavation. Discussion is provided on the progression of the external monitoring results for ground movements based on extensometers, inclinometers and piezometers, as well as internal monitoring results for the Pressure Tunnel based on multi-directional strain gauges.