Installation of the Geodrill 4 R geothermal drilling rig. This new technology enables efficient inclined drilling to depths of up to 35 m. The era of trenchless pipe laying began in 1970 with the legendary Grundomat soil rockets. Horizontal directional drilling rigs followed at the end of the 1980s. This allows pipes with a diameter of up to 70 cm and a length of up to 500 meters to be laid underground and in a controlled manner, even under rivers.