The IWM Film Archive is the oldest film archive in the UK, holding over 20,000 hours of film, video and digital material and covering the two World Wars and all conflicts involving British or Commonwealth Forces since the start of the Twentieth Century to the present. Our collection also reflects aspects of civilian life in wartime, military life in peacetime, military exercises and operations.
This film is part of Free
Video Player is loading.
Sea Fort
Surrounded by water and manned to defend the coastline, sea forts were remote outposts of Britain’s home front.
From the collection of:
Overview
Sea forts were observation and gun fortifications used to help defend Britain during the Second World War. They were also temporary homes for the various crews that were stationed there. This short propaganda film glimpses their day-to-day lives aboard one of these unusual outposts, alongside the naval guns and searchlights, ready to scour the night sky for enemy aircraft.
Also known as Maunsell Forts, some of these unusual structures were mounted on long concrete legs, or even linked together by steel bridges. They were occupied by both British Army and Navy personnel and had two primary functions; to prevent aircraft from laying mines and to help defend against Luftwaffe bombing raids. This government film is a public record, preserved and presented by the BFI National Archive on behalf of The National Archives, home to more than 1,000 years of British history.
Related
Watch for free
Home Front and Home Guard - Wartime Woking Home Front and Home Guard - Wartime Woking
Amateur film 1938 10 mins Silent Location: Woking
Woking gears up for war in this remarkable film about the Home Guard and its contribution to the town.
Watch for free
Ack-ack Ack-ack
Documentary 1941 9 mins
‘ACK ACK’ is a profile of the soldiers who manned anti-aircraft positions on the home front during the Second World War.
Watch for free
Citizen's Army Citizen's Army
Documentary 1941 10 mins Location: London
Ordinary men from all trades and professions lead double lives to hone their soldiering skills in Britain during the Second World War.
Watch for free
Civilians in Uniform Civilians in Uniform
Amateur film 1946 21 mins Location: Leatherhead
Leatherhead applauds and thanks its Civil Defence Service volunteers for their sterling efforts, in this fascinating film made during the last months of the Second World War.
Watch for free
Clandon Home Guard - drills and stand down Clandon Home Guard - drills and stand down
Amateur film 1942 12 mins Silent Location: Clandon Park
Dad's Army, Clandon-style, are at it again in this fascinating film about life in Surrey's Home Guard.
Currently unavailable
Royal Observer Corps Royal Observer Corps
Government sponsored film 1941 7 mins Location: Welwyn
Watching over the skies, a volunteer force helps identify enemy aircraft for RAF fighters to intercept over Britain’s home front.
Watch for free
New Perspectives: Pusher New Perspectives: Pusher
Short documentary 2025 5 mins
Noah Bell of Northumbria University explains why you should seize the chance to watch Nicolas Winding Refn's debut.
Watch for free
Twin Peaks star Kyle MacLachlan on working with David Lynch - Q&A Twin Peaks star Kyle MacLachlan on working with David Lynch - Q&A
Inside Film 2025 38 mins
Kyle MacLachlan talks to BFI CEO Ben Roberts about working with David Lynch on the legendary series Twin Peaks.
Watch for free
On Falling - Exclusive Q&A On Falling - Exclusive Q&A
Inside Film 2025 30 mins
Writer-director Laura Carreira talks to Nia Childs about her debut feature, On Falling.
Watch for free
Layla - Exclusive Q&A Layla - Exclusive Q&A
Short interview 2025 27 mins
Writer, director and performer Amrou Al-Kadhi talks to Rico Johnson-Sinclair about their debut feature.
Watch for free
All We Imagine As Light - Exclusive Q&A All We Imagine As Light - Exclusive Q&A
Short interview 2025 28 mins
Payal Kapadia discusses her Cannes prize-winning and Bafta-nominated drama with Ashanti Omkar.
Watch for free
Khichdi Khichdi
Animation & Artists Moving Image 2023 16 mins
The interwoven stories of four best friends who reunite in the UK, thirty-five years after training together as nurses during their teens in Ferozepur, Punjab.