>It’s mostly the weight of the chain, not the anchor, which keeps the ship in place. There’s a set of calculations for how many shots of the chain are required for a given ship size. Depending on the seabed, type of chain/rope, and tidal range, the general rule is 5-7 times the depth.

https://i.redd.it/xtch6pupx6da1.jpg

https://www.usni.org/magazines/naval-history-magazine/2017/december/anchors-chains-and-stoppers

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