Anti-submarine net stretching across the mouth of Halifax Harbour during WWII.

[Justdroppedin]

https://upload.wikimedia.org/wikipedia/commons/7/73/Anti-submarine_net_between_Fort_York_Redoubt_and_McNabs _Island.jpg

[Gates07]

i had a friend that did that for the Golden Gates Bridge during WW2 was a BM2 USN they strung it every day based in Tibron. died years ago, cancer.