Anti-Submarine Boom Nets

Anti-Submarine Boom Nets were typically used during WWII as a defense against enemy submarines from entering a protected harbor. They would stretch across the entrance to the harbor and would be lowered or moved to permit friendly vessels to enter and exit.

Anti Submarine Net
Constructing an anti-submarine boom net

 

anti submarine net
Deploying an anti-submarine boom net

 

anti submarine net buoys
An anti-submarine net being stretched across harbor entrance

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