Design, procurement &amp construction of rcc box metro tunnel including birati ug station building &amp subways (with entry-exit structures) for two underground metro stations (birati &amp michael nagar) by cut &amp cover method (top down with diaphragm wall/ bottom up method with support arrangement) including architectural finishing, firefighting, water supply, sanitary installation, drainage &amp blt works, e&ampm service, ecs service, tvs services, power supply system with 750 v dc t