The British Film Institute presents the best global cinema on-demand:
From classic and contemporary films to the best of the BFI National Archive.

Sea Fort
Sea Fort

Sea Fort 1940


This film is certified

Please confirm that you accept our terms of use.


Sea Fort 1940

7 mins United Kingdom Director. Ian Dalrymple

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.

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.

Directed by

Ian Dalrymple


Patrick Curwen


Documentary Government sponsored film War


Barracks Libraries Anti-aircarft artillery Royal Navy World War II Propaganda King's Troop of the Royal Artillery Corp of Royal Engineers Floating forts


Ready for the Enemy




United Kingdom



Read lessRead more


View All

Welcome to a new subscription service like no other.

>100s of hand-picked classics and critically-acclaimed films

>Critic Mark Kermode picks a must-see film every week

>No contract, cancel anytime

Cookies Policy

This website uses cookies, as explained in our Cookies Policy.

To accept the terms and hide this message please click 'I accept'.

I accept

Passionate about film? So are we…

Don't miss the email made for the in-the-know film fan:

New releases — on the same day as in cinemas Special collections & unheralded classics Exclusive news on discounts

Never ask | Ask me later