An oil tanker drops anchor and the anchor imbeds itself sufficiently to keep the tanker in a stable position. How does the tanker pull up the anchor if the movement of the tanker itself wasn’t enough force to pull it up?
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The anchor falls to its side when it hits the seafloor and its flukes dig into the sand or whatever. This is enough to resist lateral forces if the boat is pushed around by currents or wind. When they want to leave it’s pulled up vertically which lifts its flukes out of the seafloor:
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