Naples Underground Client Naples Metropolitana Location Naples, Italy THE CHALLENGE Building the extension to the Naples Metropolitana underground network involved driving several kilometres of track tunnel beneath heavily urbanised areas of the city and the construction of several new stations. To add another level of complexity to the project, an unusually high water table and the city’s proximity to the coast meant tunnels and stations were subject to high water pressure during construction – and long after their completion. What’s more, the inaccessibility of any waterstop for repair or replacement meant engineers had to be 100% sure of its performance against both water ingress and vibration damage. OUR SOLUTION Hydrotite CJ, a composite strip of hydrophilic and non- hydrophilic rub

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