The term 'Drilling Apparatus' can be broken down into two crossword solutions: RIG (3 letters) and OILRIG (6 letters). A RIG is a general term for any type of apparatus used for drilling, such as a drill press or a jackhammer. An OILRIG is a specialized type of drilling apparatus used to extract oil from the ground. It typically consists of a platform, derrick, and other equipment used to drill deep into the earth.