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The double-layered system of PVC-P, in combination with waterstop, injection valves, hoses, a tunnel waterproofing system can be divided and compartmentalised into small independent watertight sections. The tunnel/ structure is therefore divided into manageable sections that can be treated as individual entities. This system allows us to test for water-tightness at locations suspected of accidental damage, or in the case of leakage. Furthermore, the water infiltrations would be limited to the single damaged section/compartment. Any damage/leakage would remain localised, thus rendering easy rectification, and thereby mitigating one of the major concerns with traditional PVC-P applications. This compartmentalization forms this watertight control by utilising the gap between the two waterproofing membrane layers. This gap can be exploited to monitor the waterproofing system sealing and allows for simple future repairs by resin injection. PVC-P twin layer membrane is generally used as a waterproofing membrane, must be highly durable and shall be judiciously selected. The product should be made up of virgin PVC compound and plasticized for long term flexibility and durability. The membrane shall be supplied with a signal layer, i.e. a thin sheet of different colour, bonded to one side, which is intended to facilitate the detection of damage.