borehole

A borehole is a narrow, deep hole drilled into the ground to access underground resources such as water, oil, gas, or minerals. It involves using specialized drilling equipment to penetrate the Earth's surface and reach these subsurface materials. Boreholes are essential for extracting these resources, monitoring underground conditions, or for environmental and scientific assessments. They vary in depth and size depending on their purpose, and often require casing and other tools to ensure stability and safety during and after drilling.