Today’s delve into the Lancashire Telegraph archives has produced this photograph of an unseen and largely unknown piece of Blackburn town centre history.

Many of our readers will have walked above this very spot little realising what lay beneath their feet. But can you hazard a guess as to where it is?

Taken in 1960, the picture shows a workman inspecting the ‘bridge’ over the River Blakewater. The massive iron pillars and girders are actually supporting part of the Boulevard, then the town’s main bus station.

Equipped with essential equipment - his wellies - the worker was forced to bend double to inspect how much rubbish had been collected in the underground passage and to check the impressive stone walls of this secret underground world.

If you have any photographs of life in East Lancashire in days gone by, you can email gill.johnson@nqnw.co.uk