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
1. Sheaf and Porter River Trust Megatron Tour
The city developed at the confluence of the River Sheaf and River Don but the Sheaf has been hidden underground since the mid-19th Century. The waterway that gave Sheffield its name is directed through culverts under the railway station and city centre. A complex of Victorian tunnels includes a large, brick-vaulted "cathedral" often called the Megatron. Photo: Steve Ellis
2. Megatron Tour
Sheaf and Porter River Trust now operate Megatron Tours deep under the city Photo: Steve Ellis
3. Wading in the waters
Sheaf and Porter River Trust Megatron Tour, pictured is Anthony Wood, a River Trust Volunteer and Guide Photo: Steve Ellis
4. Hole in the road
The infamous Hole in the Road was built in 1967. The main feature was a kind of giant oculus through a curved roof in the middle of the busy roundabout, exposing the underpass network. Photo: Sheffield Newspapers