Beneath Upper St Giles Street is a 27-metre-long cellar which was once home to the Eaton Rifle Club in the 1960s.

It was originally built as a wine cellar in the 1780s and was the largest in East Anglia.

Tours begin in April (Image: Submitted)

The Shoebox Experiences, a non-profit organisation in the city, is launching a guided tour in the vault this month.

But ahead of its debut on Friday, Lisa Willett, the company's customer experience manager, has revealed inside information from a former rifle club member.

She said: "Roy, who used to take his daughter with him to the shooting range, got in touch with us.

"His daughter remembers it being a really damp and dark space.

"We now know during the weekdays, the British Telecom and Eastern Electricity Board workers would used it for shooting.

Learn about the myths of underground Norwich (Image: Submitted)

"The Norfolk Police used the space as a social club until the 2000s.

"There were two types of rifle guns which could be used.

"These were .22 rim fire rifles shot from a long range and small hand held pistols shot from shorter range.

"You can still see the shooting booths and one of the targets on the tour.

"Some people weren't great at hitting the tiles as there are bullet holes in the walls."

Tickets for the tour are still available on the Shoebox Experiences' website between April and June but are "limited".

"More will be released in the coming weeks," Ms Willet said.

The space is privately owned and the Shoebox Experiences is taking out a short-term lease to run the tour.

© Eastern Daily Press