Laser scan showing how the passages in the Peel Street Caves
An archaeologist has called for more of Nottingham's sandstone caves to be opened up to the public.
Dr David Walker is surveying the caves and said the Peel Street Caves are of particular importance, but largely only accessible on Heritage Open Days.
He said: "We'd certainly like to see it open on a more regular basis in the future."
Dr Walker said he is negotiating with Nottingham City Council, but safety and funding are the main issues.
The Peel Street Caves, also known as Rouse's Sand Mine, are located to the west of Mansfield Road.
They were created during the 1700s and are 200 metres from end to end.
The caves are a particular favourite of Dr Walker who described them as "huge, very dark and spectacular".
He said: "We're gently negotiating with the [Nottingham City] council at the moment and [opening up the caves] will be a point of contention for some time to come.
"There are a number of issues along the way; it only has one working entrance and exit, there are no lights.
"These things are surmountable but they require money and political will. Political will is easier to get but money is harder in the current climate."
It would not be the first time the Peel Street Caves have been a tourist attraction. In 1892, they were opened and known as Robin Hood's Mammoth Cave.
The Nottingham Caves Survey
began in March 2010.
A team from Trent and Peak Archaeology are producing a record of more than 500 sandstone caves around Nottingham.
The project, costing £250,000, has been funded by the Greater Nottingham Partnership, East Midlands Development Agency, English Heritage, the University of Nottingham and Nottingham City Council.
Inside Out East Midlands will be featuring Dr David Walker in a film about Nottingham's manmade caves on Monday, 21 February 2011.