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Assuming you are on a boat and you are using a standard sized anchor, then if the water is 20 feet deep you'd use 20 feet of line.
217 - 20 = 197 Therefore, it is 197 feet between the seabed (and anchor) and the sea level.
20 teaspoons of water is 100 grams
20 cm of water is about 1.96 kPa.
I can hold 20 liters of water.