The second edition of the book from the IRO series has been extensively revised and restructured compared to the first edition. After clarifying fundamental terminology, the focus is initially on geology, followed by a presentation of the applicable product pipes. Chapter 4 is dedicated to equipment technology, and Chapter 5 covers drilling fluid technology. Chapter 6 outlines the various locating methods that are essential for the success of a HDD operation. Chapters 7 and 8 address the fundamental topics of planning and executing a horizontal drilling operation. The conclusion is provided in Chapter 9, which presents additional applications of horizontal drilling technology. A competent and comprehensive practical reference work on a new technology.