Take a look at the weird and the wonderful things that lie beneath our feet as well as pictures of people waiting to use an underground subway for the first time as we delve deep and explore Sheffield's subterranean past.
Want more Sheffield retro? Fargate through the decades, Construction pics of the Winter Gardens
13. Air raid shelter discovered
Steve Wagstaffe in the former air raid shelter discovered at the rear of his business premises, Alleqip in Attercliffe in the late 1990s Photo: Sharron Bennett
14. Air raid shelter entrance
The air raid shelter cover at Eye Witness Works on the corner of Milton Street and Headford Street Photo: vin malone
15. Catcliffe Primary School
The air raid shelter discovered in 2009 under the playground at Catcliffe Primary School in Rotherham Photo: Dean Atkins
16. Archaeology students
King Edward V11 AS Archaeology students Richard Scholey, John Crowley and James Hughes-Lawson pictured in the WW11 air raid shelter under the school in 2005 Photo: Barry Richardson