Leg penetration to depths which require pullout forces greater than that which can be supplied by the buoyancy of the hull may exist in __________.

Correct Answer: Option A — soft to firm clays

Soft to firm clays develop high adhesive and cohesive shear resistance against jack-up spandcans or footings during penetration. This often generates significant suction and holding capacity, requiring high pullout forces that may exceed the buoyant lifting capacity of the hull.