What would you find if drilled into the Abyssal plain?

The Abyssal plain is the vast, flattest regions on Earth, found at the bottom of the ocean basins. It covers about 40 percent of the total surface area of the Earth. These plains are the deepest parts of the ocean and are typically found between 4000 to 6000 meters deep. If a hole was drilled into the Abyssal plain, you would find a thick layer of sediment. The sediment is composed of mud, clay, silt, and microscopic fossils of sea creatures that have settled on the ocean floor. The thickness of the sediment can vary from a few meters to several hundred meters thick, depending on the age of the plain and the amount of deposition. Beneath the sediment layer, there would be a layer of basaltic rock, which is formed from the cooling of lava. The basaltic layer can be several kilometers thick and is underlain by the Earth's mantle, which is composed of peridotite rock.