A passenger subway, including a lift shaft, commencing by a junction with the existing Piccadilly Line Station concourse beneath a point 56 metres north-west of the junction of York Way with Euston Road, passing northwards to junctions with the passenger subway (Work No. 4AA) and the cross passage (Work No. 4N) then continuing south-eastwards and terminating by a junction with the passenger subway (Work No. 4AA) beneath a point 45 metres north-east of that road junction;