Learn About the Abandoned Maunsell Army Sea Forts in England


The history of England is filled with stories of battles, conquests, and grand structures that once stood proud but have now fallen into ruin. Among these, the Maunsell Army Sea Forts hold a unique place. These abandoned structures, situated in the waters off the coast of England, were built during World War II as a defense mechanism against German air raids. 

Learn About the Abandoned Maunsell Army Sea Forts in England

Made up of several interconnected towers, these forts were designed to house soldiers and anti-aircraft guns to protect the country’s shores. However, with the end of the war, these forts became obsolete and were eventually abandoned.

Maunsell Sea Forts

Historical overview of the Maunsell Army Sea Forts

Located off the coast of southeastern England, the Maunsell Sea Forts are a series of abandoned sea forts that were built during World War II. 

During World War II, the British government faced a significant threat from German air and naval attacks. As a result, they needed to establish a strong defense system in the coastal areas. 

The Maunsell Forts, also known as “sea forts,” were a series of fortified towers built in the Thames and Mersey estuaries to protect these crucial waterways. The forts were designed by civil engineer Guy Maunsell and were constructed in 1942. These structures were made to withstand heavy bombardment and serve as lookout posts for enemy ships and planes.

The forts were strategically placed in the Thames and Mersey estuaries, as well as in the coastal waters of Kent and Essex. These locations were chosen for their proximity to major ports and shipping lanes, making them ideal for intercepting enemy vessels.

Maunsell Sea Fort

Decommissioning and abandonment of the forts

The Maunsell forts, served their purpose in protecting England’s seas after the war. However, as advancements in technology and warfare rendered them obsolete, discussions began to surface about the end of their military use. 

The forts were decommissioned in the late 1950s. However, they were not left abandoned. Instead, they were repurposed for other activities, including pirate radio broadcasting. They became home to several pirate radio stations in the 1960s and 1970s, broadcasting popular music to a wide audience. This unconventional use of the forts brought attention and controversy, with the government eventually shutting down the pirate radio stations.

One of the forts, managed by the unrecognized Principality of Sealand, receives occasional visits from boats. However, the remaining forts have fallen into a state of disrepair. In an effort to preserve these historic structures, a consortium called Project Redsands is planning to conserve the fort situated at Red Sands.

Shivering Sands Maunsell Sea Forts

Maunsell Sea Forts as a tourist attraction

The Maunsell Sea Forts have since become a tourist attraction mostly for their bizarre appearance – as metal-made bases standing above the waters. Now color red due to the accumulated rust over the past decades, the forts are seen as a testament of how technology changes the needs of military operations, and how such transformation turned these structures obsolete.

To visit the Maunsell Forts, one can take a boat tour from Whitstable or Hearne, which typically lasts about an hour. During the tour, visitors will also have the opportunity to explore the impressive Kentish flats wind farms. These modern offshore wind turbines are truly awe-inspiring and can only be fully appreciated by standing beneath them.

Since the Maunsell Forts are near London, they can be included in one’s day trip of the city.


The Maunsell Army Sea Forts provide a fascinating glimpse into the history of England’s military defenses during World War II. These abandoned structures stand as a testament to the ingenuity and resourcefulness of the British army, and serve as a reminder of the sacrifices made during times of war. 

While they may no longer serve their original purpose, the forts continue to capture the imagination of visitors and stand as a unique piece of maritime history. Whether you’re a history buff or simply looking for a unique adventure, a visit to the Maunsell Army Sea Forts is sure to be an unforgettable experience.

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