The very latest laser technology combined with old fashioned pedal power is being used to provide a unique insight into the layout of Nottingham’s sandstone caves — where the city’s renowned medieval ale was brewed and, where legend has it, the country’s most famous outlaw Robin Hood was imprisoned.

The Nottingham Caves Survey, being carried out by archaeologists from Trent & Peak Archaeology at The University of Nottingham, has already produced extraordinary, three dimensional, fly through, colour animation of caves that have been hidden from view for centuries.

Below the grounds of Nottingham Castle and across the city there is a labyrinth of medieval tunnels, dungeons, maltings and cellars — people even carved primitive living quarters out of Nottingham’s sandstone cliffs....