The structure in this film is derived from a single tower of the Maunsell army forts built in groups of seven to defend the Thames Estuary and River Thames ports during WWII. The Red Sands group and six of the seven Shivering Sands towers remain, as of this movie's release.
Most of the inside scenes were filmed in Linnahall, a multi-purpose venue in Tallinn, Estonia - the same building which stood in for Kiev Opera Hall in Tenet (2020).
Sentinelle (2023) (also known as "Last Contact" in some territories) is a science fiction thriller film starring Kate Bosworth and Lucien Laviscount. It is directed by Tanel Toom and written by Malachi Smyth.
Principal photography took place near Tallinn, Estonia and was completed by October 2021. Filming locations also included the Maunsell Forts off the coast of Kent in south-east England. The forts consisted of multiple towers, originally connected by bridges. The outpost in the film comprises a single tower, its design based on one of the real towers.
PROLOGUE: "Human activity has caused a massive rise in sea level. Most of the planet is flooded. Survival is a constant fight for land and resources. Two continents remain. At war."