SECRET Nazi bunkers have been uncovered near beaches stormed by Allied troops during the D-Day landings in June 1944.
The bunkers were part of the Maisy Battery, a batch of German artillery guns used to defend the Normandy beaches during the invasion.
The complex was discovered in 2006 and excavations continue to turf up new finds.
The bunker discovery will be featured in the season premiere of “Expedition Unknown,” which airs on Discovery Channel today (February 5) at 8pm ET.
"We discovered huge Nazi bunkers that haven't seen the light of day in 75 years," Josh Gates of Expedition Unknown told Fox News.
"We were able to dig down and reveal the doors and go inside them – they are frozen in time, there are artefacts inside there."
The Maisy battery was built two miles from the Omaha and Utah beaches, which were attacked by American troops on D-Day.
It was one of Germany's largest defensive positions, boasting a total of 14 huge guns, including 150 mm Howitzers.
Smaller 88 mm anti-aitcraft guns and machine gun nests littered the compound, as well as two Renault tanks.
Following the Allied victory, the site was abandoned and its complex of bunkers, trenches and living quarters was gradually overtaken by nature.
It lay untouched for decades until British history expert Gary Sterne unearthed it in 2006 using extensive research of European archives and contemporary maps.
Ongoing excavations have since found a dozen buildings including a radio room, sick bay and kitchens linked by nearly 5,000 feet of tunnels.
For the new study, experts scanned the Maisy Battery with LiDAR (Light Detection and Ranging) technology, which uses a laser to measure distances deep beneath the ground.
LiDAR allows experts to search for structures buried below thick layers of dirt or brush.
D-Day — How the historic battle was fought
June 6, 2019 marked the 75th anniversary of the D-Day landings in Normandy when more than 160,000 servicemen began the push to liberate France.
Ships gathered in the middle of the English Channel at point called Piccadilly Circus before making their way to the Normandy beaches.
Paratroopers land behind enemy lines before the main assault begins with British soldiers tasked with securing the Benouville bridge on the Caen canal with Lieutenant Den Brotheridge leading the charge.
He becomes the first Allied soldier to die in the assault when he is hit in the neck by machine gun fire.
US paratroopers land with the aim of securing the town of Sainte Mere-Eglise, which is on the main road to Cherbourg which is the first French town to be liberated after hours of fighting.
Allied warships start to open fire on the German sea defences with HMS Warspite firing off a broadside which marks the British and Canadian assault on Juno, Sword and Gold Beaches.
US forces land on Utah and Omaha Beeches and come under fire from Nazi troops.
By around midday commandos and troops finally reach the key bridges after heavy fighting to meet up with the paratroopers.
Prime Minister Winston Churchill addresses the House of Commons.
He tells MPs: “During the night and the early hours of this morning the first of the series of landings in force upon the European continent has taken place.”
In total, two large bunkers, each containing three or four rooms linked by hallways and staircases, were discovered.
Researchers found burn marks on the ceiling of the bunkers, suggesting there may have been a firefight involved in the capture of the complex.
"It’s an overwhelming place to visit – this was part of one of the darkest chapters in modern history," said Gates.
"There’s all sorts of things inside the bunker, we discovered the remains of gas masks, ammunition, Nazi helmets.
"What is unique is that a lot of the military installations around Normandy have been cleaned up," he continued.
"Maisy is one of the few places where you can explore trenches and beaches and get a sense of what it was like on D-Day."
The complex was part of Hitler's famous "Atlantic wall", a massive chain of defences built across the northern coast of France in anticipation of an Allied invasion.
Using forced labour brought in from the Soviet Union, the Nazis were able to keep the locations of many defensive positions secret from locals, who they feared would reveal them to French resistance or Allied troops.
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