No !! not the Martians from The War of the Worlds.The Maunsell Sea Forts were small fortified towers built in the Thames and Mersey estuaries during the Second World War to help defend the United Kingdom. They take their name from their designer Guy Maunsell.

No !! not the Martians from The War of the Worlds.The Maunsell Sea Forts were small fortified towers built in the Thames and Mersey estuaries during the Second World War to help defend the United Kingdom. They take their name from their designer Guy Maunsell.