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AbstractBurying cable in dense ocean bottom sands requires huge plowing forces. This is because of the "pore water" effect. When compact sand shears, the grains must roll over one another. In so doing the spaces (pores) between the grains expand. Water pressure in these pores must decrease in order to draw in water to keep the pores filled. The drag of this permeating pore water squeezes the grains together, increasing the frictional force that shears the sand. Hence the drawbar is increased. The faster and deeper the plow tool operates, the greater the decrease in pore water pressure, and hence the greater the drawbarup to a
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