What is borehole drilling?

Borehole drilling is the drilling of a narrow shaft into the Earths surface, they're constructed for a range of different purposes such as the extraction of water or other liquids such as oil, and also natural gases.

They're often drilled also as part of a geotechnical investigations and environmental site assessments.

Hundreds of years ago it was carried out by sheer brute force using a rod that was called a bore. Nowadays though we have borehole drilling rigs that are capable of drilling to much greater depths.