 The preferred route takes it past this park, and Thames Water proposed that part of the park should be used for construction of the tunnel, leaving a permanent access road through the park from The Highway and a ventilation shaft built on an extension to the foreshore.Tower Hamlets Council announced official support for an option which would at least leave most of the park accessible during construction, and reinstate it at the end.However, after looking at Thames Water's plans in more detail, it has emerged that the preferred option could make the park unusable for several years.