Disused nuclear bunkers in Cumbria and Northumberland are proving a hit with website bidders hoping to net a slice of Cold War history.
The Stannington bunker is sited north of Newcastle
Two bunkers in Cumbria and one in Northumberland are being offered for sale on the Internet site eBay.
They are among 13 being sold by an auction on the web.
At 1400 BST on Monday, the bunker at Hawkshead, Cumbria was proving the most popular of all 13, with almost 30 bids, the highest of which is for £7,767.
Another site at Flookburgh in Cumbria received 22 bids, with a top offer of £1,800.
And a bunker at Stannington, Northumberland attracted 16 bids, the highest of which is £3,000.
The bunkers were designed to house a three-man monitoring team 15ft below the surface.
The sites, each without gas, electricity or water, are being tipped as the latest must-have investment opportunity.
The bunker in Hawkshead is proving the most popular
Three similar bunkers in Lincolnshire and Nottinghamshire went for more than £8,200, with one attracting 15,000 hits and 79 bids.
Chartered surveyors JH Walter are handling the sale of the bunkers, which started on 22 May, and is to close on 1 June.
The bunkers are all set in land 15 yards by 20 yards, with a ventilator shaft and an access shaft leading to two rooms - one housing beds, desks and equipment, and
the other a toilet.
The last watcher climbed to the surface more than a decade ago in 1992 after the bunkers were decommissioned following the collapse of the Soviet Union and the end of the Cold War.
Rob Ward, of JH Walter said: "There are a lot of enthusiasts wanting a piece of Cold War history to restore.
"Speculators have shown interest and we have also had people wanting to use them as observatories for astronomy, because they are in places where there is
very little light pollution."
The company is holding open days for the public on all the sites on 25 May.