Uploaded December 2025 | Updated September 2026, 2 weeks ago
Yet more submerged monuments have been found off the coast of Brittany in France. Several massive stone walls and other features were discovered by a retired geologist analysing LiDAR data in 2017. Five years later archaeological dives began which mapped the structures and examined their architecture. Now a new paper has been published which discusses the features in more detail. The earliest ones date back around 8,000 years when the sea level was lower and use complex construction techniques including reinforced monoliths. They are characteristic of a transitional time when Mesolithic maritime hunter-gatherers were starting to develop a more sedentary lifestyle. In this video I discuss what these structures were likely used for and how they were dated.
#ancient #ancienthistory #neolithic
✨ IN THIS EPISODE
01:05 Brittany’s Megaliths: Monuments of Mystery
02:28 Sunken Secrets of Île de Sein
06:24 Unlocking Their Purpose: Structure and Function
✨ JOIN MY CHANNEL
youtube.com/channel/UC0Hs5t0U6Uf993Tba22YmKA/join
✨ OTHER VIDEOS MENTIONED
Brittany's Many Submerged Megalithic Structures
youtu.be/eupDk_9Kh_g
Submerged Mesolithic Megastructure Found in the Baltic Sea
youtu.be/zw-558TUiwk?si=Wkg2vVwxgK9MHRl9
✨ FOLLOW ME ON SOCIALS
BlueSky: @MegalithHunter.bsky.social
✨ REFERENCES
Yves Fouquet, Jean-Michel Keroulle, Pierre Stéphan, Yvan Pailler, Philippe Bodénès, et al.. Sub-
merged Stone Structures in the Far West of Europe During the Mesolithic/Neolithic Transition (Sein Island, Brittany, France). International Journal of Nautical Archaeology, In press. hal-05406477
✨ PHOTOGRAPH CREDITS
Google Earth
Locations
CC BY 4.0 DEED creativecommons.org/licenses/by/4.0
Figures from the paper referenced above
CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0
Les Causeurs menhirs, credit: Gzen92
CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0
Broken Menhir of Er Grah, credit: Myrabella
Carnac alignments, credit: Lionel Allorge
Yet more submerged monuments have been found off the coast of Brittany in France. Several massive stone walls and other features were discovered by a retired geologist analysing LiDAR data in 2017. Five years later archaeological dives began which mapped the structures and examined their architecture. Now a new paper has been published which discusses the features in more detail. The earliest ones date back around 8,000 years when the sea level was lower and use complex construction techniques including reinforced monoliths. They are characteristic of a transitional time when Mesolithic maritime hunter-gatherers were starting to develop a more sedentary lifestyle. In this video I discuss what these structures were likely used for and how they were dated.
#ancient #ancienthistory #neolithic
✨ IN THIS EPISODE
01:05 Brittany’s Megaliths: Monuments of Mystery
02:28 Sunken Secrets of Île de Sein
06:24 Unlocking Their Purpose: Structure and Function
✨ JOIN MY CHANNEL
youtube.com/channel/UC0Hs5t0U6Uf993Tba22YmKA/join
✨ OTHER VIDEOS MENTIONED
Brittany's Many Submerged Megalithic Structures
youtu.be/eupDk_9Kh_g
Submerged Mesolithic Megastructure Found in the Baltic Sea
youtu.be/zw-558TUiwk?si=Wkg2vVwxgK9MHRl9
✨ FOLLOW ME ON SOCIALS
BlueSky: @MegalithHunter.bsky.social
✨ REFERENCES
Yves Fouquet, Jean-Michel Keroulle, Pierre Stéphan, Yvan Pailler, Philippe Bodénès, et al.. Sub-
merged Stone Structures in the Far West of Europe During the Mesolithic/Neolithic Transition (Sein Island, Brittany, France). International Journal of Nautical Archaeology, In press. hal-05406477
✨ PHOTOGRAPH CREDITS
Google Earth
Locations
CC BY 4.0 DEED creativecommons.org/licenses/by/4.0
Figures from the paper referenced above
CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0
Les Causeurs menhirs, credit: Gzen92
CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0
Broken Menhir of Er Grah, credit: Myrabella
Carnac alignments, credit: Lionel Allorge
