Flat goes on sale with untouched World War II secret buried beneath garden

A two-bedroom flat in London is on the market with a hidden secret as it contains a WWll underground bunker complete with blast-proof doors.

From the outside the home, in the Laboratory building on Rosebery Avenue in Clerkenwell, appears to be relatively standard, albeit attractive property with high ceilings, bright décor and a patio terrace.

But it is through into the garden that it holds a special surprise for a potential buyer.

A small, unassuming door looks as though it could lead to a brick shed, but all is not as it seems.

Inside, stairs lead underground to a huge 1,610sq ft bunker – complete with blast-proof doors, heating, lighting and a ventilation system.

The former owner bought the property when the bunker was derelict and has since converted it into usable living space.

The WWll bunker has been converted into living space for a potential buyer (Jam Press/Unique Estates Property Services)

The bunker could be used now for anything from a gym to an office (Jam Press)

It was originally built during WWll, where the Laboratory building was used by Thames Water scientists to test reservoirs and rivers up and down the country.

When the war broke out, the bunkers were constructed to house the staff and protect them from air raids.

There is a second bunker which is accessed via another flat in the building.

London's property prices maybe sky high but this home just a stones throw from Angel London Underground station does offer something out of the ordinary for for £800,000.

According to estate agents Unique Estates, the bunker could be used for anything from an office to a gym.

From the outside the flat looks like a typical London property valued at £800,000 (Jam Press/Unique Estates Property Services)

The property has high ceilings, light and bright décor along with a patio terrace (Jam Press/Unique Estates Property Services)

Their listing reads: "Located within this impressive converted Art Deco building, which is part of the New River Head - formerly the Metropolitan Water Board - on Rosebery Avenue, we are pleased to offer this two bedroom apartment within The Laboratory Building.

"This apartment offers the occupier a different style of residence from normal flats with high ceilings throughout, a bright living space which includes an open plan kitchen with built in appliances and two double bedroom with good storage and a delightful patio terrace.

The WWll underground bunker has blast-proof doors (Jam Press/Unique Estates Property Services)

"There is also a separate underground bunker that has a very spacious fully refurbished space which could ideally be used as an office or a music room, gym or just storage; an amazing space.

"The Laboratory Building still retains much of its 1930's style with original hallways, a large beautifully maintained communal rose garden and daytime concierge.

"The bunker has a ventilation system and heaters, it also has lights throughout (lower lighting, walls and ceiling) with separate switches for different sections. Fully private and sole use throughout."