Haile Sand Fort

Following the outbreak of the First World War, English towns and cities like Hull, Grimsby and Immingham came under aerial attack, first from German airships, then aeroplanes.

Work started on building two forts on the mouth of the Humber Estuary in 1915. This one is off Humberston, Lincolnshire and Bull Sand Fort lies off Spurn on the Yorkshire side, seen in the distance below.

Soldiers were billeted in Cleethorpes (4000 by 1916), including at the Fitties camp which continues today as a chalet park. Up to 200 soldiers could stay on the fort itself.

It opened in 1917 and construction wasn't fully complete until 1918. It stands 59ft above the water ane has a diameter of 82ft.

Costing up to half a million pounds, according to Cleethorpes Heritage, no shot in anger was fired. Indeed, Bull Fort was so hard to build, built on sand 120ft down that it was only completed a month before the end of the war.

The effort was not wasted though as they were reactivated and modernised in WW2, seeing much action. They hosted "12pdr QFs and then 1940 with twin 6-pounders" (Victorian Forts). Netting was laid across the estuary to stop submarines entering.

Abandoned in 1956, both forts survive the sea's onslaught. Bull was bought by a charitable trust in 1997 for £21,000, with unrealised plans for a drug rehabilitation facility, while this one's on the market.

Accessing the fort

It sits a good mile from shore at high tide, and around 100 yards at low tide.

The tidal distance is huge here and when venturing from dry land, attention needs to be paid to the channel separating the vast high sands beyond. It's a 15 minute march to the lower-tide shore.

Wind and current affect conditions. An outgoing tide is beneficial for reaching it, but potentially unforgiving if turning around and swimming against it.

Around 100 years of being pounded by saltwater has made the ladders and wooden jetty treacherous, ready to collapse at the slightest tug. Rusted metal under the surface is an elaborate spike pit. Near the low tide mark: sea mushrooms—big, white bulbous growths attached to the edges.

Beams covered with barnacles and seaweed offer access to the platform.

The panels are weather scarred, rusty and colourful. Doors are sealed. There's no easy way of climbing up to the windows above. You're cold, with numb hands and feet. Your chest and stomach get cut climbing down. You swim back. 

Orford Ness, AWRE and Cobra Mist

Secret military activity on Suffolk's Orford Ness peninsula dates back to the First World War when the MOD took it over and built a Royal Flying Corps airfield on the marshes.

RoughGuides.com

The remoteness of this 12 mile long shingle spit made it suitable for experimenting with aerial machine guns, bombs, navigation, photography and parachutes, which continued in the interwar period.

Radar's early development

The Orfordness Beacon (set up in 1929) was one of the earliest experiments in long range radio navigation, then in the mid 1930s work started on a new defence system that became known as radar.

Led by Sir Robert Watson-Watt, early work took place in the old WW1 huts before moving further down the coast to Bawdsey Manor. Their work brought about the Chain Home network, instrumental in overcoming the German threat from the air.

Second World War

Though the airfield was not used, the Aeronautical Armament Experimental Establishment was based here. Activities included "assessment of the vulnerability of aircraft to hostile fire" (English Heritage).

More buildings went up on 'The Street' and batteries were built to counter VI Flying Bomb guided missiles.

Atomic Weapons Research Establishment and 'controlled ruination'

Ballistics observation tower

From 1953 to 1971 the AWRE had a base here and conducted environmental testing on explosives including Britain's first atom bomb, Blue Danube.

According to English Heritage's detailed report, in 1960 the Establishment stated "there will be no tests involving the release of radioactive matter".

However, it describes how one former employee said tests were done with "either high explosives or their fissile/fusion components, but never both together", and "remembered being present during an overnight test on a system with components made of plutonium".

Laboratory 1

Laboratory​ 3

Laboratory​ 2

The structures were designed to contain any accident, like the Vibration Test Buildings or pagodas, whose roofs would collapse

and seal any explosion with concrete and shingle.

Since 1993 this part of the peninsula has been owned by the National Trust whose policy is to allow the site to decay while minimising human interference. 

Survivors of high pressure, shock, extreme temperatures and high vibrations, the buildings' main threat is the encroaching sea, constantly eroding and reshaping this fragile environment.

Cobra Mist, a $1 billion folly

pillboxesinsuffolk.blogspot.co.uk

Further north, construction began in 1967 on a new Anglo-American project codenamed Cobra Mist.

AN/FPS-95 441a was an over-the-horizon (OTH) radar system pointed at Moscow, designed to monitor soviet activity.

Testing began in 1971 but in 1972 problems emerged with noise interference affecting reception for which no explanation was found. Spyflight suggests the Russians could have been to blame, its signals jammed by agents in a trawler in the North Sea.

The USAF gave up and left in June 1973. Costing around $1 billion in today's money, it was the largest, most powerful and sophisticated OTH radar at the time with a broadcast signal of 10MW. 

Globalsecurity.org gives an impression of what the array might have looked like before removal in the mid 1970s.

"...a huge fan-shaped array of aerials supported on masts from 42 feet to 195 feet high. The antenna consisted of 18 log-periodic antenna strings, which radiated like spokes in a wheel from a central "hub." Each string was 2,200 ft in length and carried both horizontal and vertical radiating dipoles. The strings were separated by 7 deg in angle, and they thus occupied a 119-deg sector of a circle. The complete antenna was located over a wire-mesh ground screen, which extended beyond the strings in the propagation direction."

studylib.net

Spyflight says

"The radar was controlled from a large steel blockhouse which stood on short legs behind the array and was connected to the array by cables running to an underground chamber, lined with copper, in front of the array."

The above photo is at the 'hub' of the fan, but no underground chamber was found. Taught lines of wire remain on parts of the ground, remnants of the wire mesh screen.

The 80 acre expanse is a now a haven for wildlife, from rare insects, plants and fungi to grey canine-like animals that when startled bolt toward the main building. 

Orfordness Transmitting Station - the BBC looks east

In the late 1970s the Cobra Mist site came under control of the Foreign Office as Orfordness Transmitting Station, and from 1982 to 2011 was owned by the BBC, broadcasting the World Service to continental Europe.

Wikipedia describes the three types of aerial:

"The directional aerial for 648 kHz (erected in 1981-82) consisted of a row of five 106.7 metre (350 ft) freestanding steel lattice towers of triangular cross section."

"The directional aerial for 1296 kHz (erected in 1978) consisted of six freestanding steel lattice towers. Unlike the directional aerial for 648 kHz, they were arranged in two parallel rows with three towers in each." 

"There was also a back-up omni-directional mast radiator for 648 kHz (erected in 1983), which could only handle transmitter powers of up to 250 kW and was only used when maintenance work was being carried out on the directional antenna"

Future plans

The site closed then transferred to private ownership in 2015. Martin Fletcher visited last year for the Economist's 1843 Magazine and described the Cobra Mist building:

"Empty halls except for one that was filled with huge grey transmitters [...] an old glass-fronted control centre, rooms within rooms to thwart electronic eavesdropping, inner sanctums with beryllium-coated steel doors and handles on the inside only. Labyrinthine passages to offices with fading maps of Europe on the walls, tool shops, a canteen, a recreation room, a sick bay, old filing cabinets and packing cases stuffed with who knows what. Internal staircases descending into the murky flood waters below."

1843 Magazine

Interviewed, the new owner said he bought it as "it's a folly of grandiose proportions" and hopes to create local employment. Broadband, communications, a data centre and a solar farm are mooted as potential new uses for the site.

Going Underground in Donny

Emergency 'Borough Control' centres were built in many towns in the UK during the Cold War.

The bunkers were designed to serve as boltholes for the town's leadership and emergency services from where they could coordinate activity and communications in the event of nuclear attack.

Rear

Doncaster's was built in the '60s under the Coroner's Court.

Front

It's now in the process of demolishment, so it was decided to carry out a perfunctory inspection before a game of darts at the welcoming Corner Pin pub around the corner.

Above was the Signals room. Compare with the photo below of SubBrit's visit in 2003.

All rooms were largely stripped out and it was difficult to determine their use, but there would have been Administration, Operations, Scientists & Reconnaissance, Conference & Controllers and Plant, as well as toilets and a kitchen.

According to SubBrit, "the plant room has a Braby generator, switchgear and ventilation and filtration plant by Keith Blackman Engineering of London, the unit being called 'The Tornado.'"

Emergency hatch

With the removal of such refuges, we can hope their need is now also gone.