Yeah car park mate, the rest is just the river
The Leeds Railway Undercroft (aka Dark Arches) were formed to build the then new Leeds Station straddling the river Aire and the Leeds and Liverpool canal and most of the rest of the arches used as car parking accessed from Dark Nevell Street.
http://filming.networkrail.co.uk/locationlibrary/darkarchesleeds.aspx?t=1
A outline plan for a new southern entrance to Leeds Station is also on the cards;
http://www.wymetro.com/uploadedFile...15-IV-09 - Traffic Access and Urban Realm.pdf