If the top 2m of soil is rapidly excavated, what will happen to the undrained strength of the soil at 8m depth immediately following the completion of the excavation? Increase, decrease, or remain essentially the same? Explain your reasoning. If a sample of the clay in the problem above is taken at 8-m depth many years after the excavation, would its undrained strength be higher, lower or essentially the same compared to its value before excavation? Explain your reasoning.