The earth's crust, a mere fraction of its total volume, varies in thickness across the planet, with the Moho layer marking the boundary to the mantle below. During the mid-20th century, the US and Soviet Union embarked on a race to drill deeper, with the US's Project Mulhole achieving only 183 meters beneath the ocean floor. Despite its failure to reach the mantle, the project laid the groundwork for future offshore drilling techniques. Meanwhile, the Soviets initiated their own drilling efforts in the Kola Peninsula, highlighting the ongoing quest to uncover the mysteries beneath our feet.
