Anchors alone just slide in the seabed. It's the weight of several meters of chain close to the soil that holds the anchor in place.

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Actually, it’s the anchor, not the chain, that holds the ship in place. The anchor’s flukes dig into the seabed to grip it, while the chain adds weight to keep the anchor set. Without the anchor, just the chain wouldn’t stop the ship from drifting. I know this because I own a ship an I have to use an anchor to keep it in place

I said large ships. This is not about small boats. Read about the catenary effect in the procedures large ships need to calculate in order to correctly do it. The anchor is simply too light for them.

I'll have to research this 🤔