City treasure hunter Callum Jensen.
Lincoln Cathedral's alleged secret stash of treasure is to be the subject of a TV programme.
City treasure hunter and author Callum Jensen is set to discuss his theories in an episode of psychology programme Gardiner's World.
The 52 year-old, who has written several books under the pen name Dan Green, believes there is a series of secret tunnels under the cathedral, which contain treasure left by the Knights Templar.
The show is screened on Sky satellite channel Edge Media TV and filming is due to begin in January.
"Dan Brown's Da Vinci Code bubble has burst but the Lincoln Cathedral code is still alive," said Mr Jensen.
"Until someone has a look at my location and discovers nothing then the possibilities of what could be there are exciting.
"I got a call out of the blue for the television show. Philip Gardiner's programmes are all about codes and freemasonry."
Gardiner's World host and author Phil Gardiner said he was looking forward to discussing the cathedral's symbolic mysteries with Mr Jensen.
"Certainly Lincoln with its immense heritage has more chance of having something interesting there," he said.
"These were stories in stone created by many people during periods of great change, such as the Civil War, or the periods of religious intolerance and so a lot of things were often hidden."
For more on Mr Jensen's theories, see Thursday's Echo.