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2. Tunnel boring machine - Wikipedia

   en.wikipedia.org/wiki/Tunnel_boring_machine

   One of the boring machines used for the Channel Tunnel between France and the United Kingdom. A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand, each of which requires specialized technology.

3. Directional boring - Wikipedia

   en.wikipedia.org/wiki/Directional_boring

   Directional boring machine. Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig.

4. Microtunneling - Wikipedia

   en.wikipedia.org/wiki/Microtunneling

   Because of their small diameter, it is not possible to have an operator driving the tunneling machine, so they have to be remotely operated. [1] Micro tunnel boring. Microtunnel boring machines (MTBM) are similar to larger tunnel boring machines (TBMs). The MTBM and jacking frame are set up in a shaft at the required depth.

5. Trenchless technology - Wikipedia

   en.wikipedia.org/wiki/Trenchless_technology

   Trenchless construction includes such construction methods as tunneling, microtunneling (MTM), horizontal directional drilling (HDD) also known as directional boring, pipe ramming (PR), pipe jacking (PJ), moling, horizontal auger boring (HAB) and other methods for the installation of pipelines and cables below the ground with minimal excavation.

6. StraightLine HDD - Wikipedia

   en.wikipedia.org/wiki/StraightLine_HDD

   StraightLine entered the HDD market with the introduction of its line of DirectLine drills in 1989. In 1991 the company moved to a 36,000 sq ft (3,300 m 2). facility in Newton, Kansas, and opened a new 9,000-square-foot (840 m 2) engineering/technical support facility on the 13-acre (53,000 m 2) grounds.

7. Underground pneumatic boring - Wikipedia

   en.wikipedia.org/wiki/Underground_pneumatic_boring

   If the soil is rocky the tool may be deflected or fail to pound forward due to its inability to break the rock. These drawbacks can be overcome by directional boring or straight-line horizontal underground boring machines that use either wet (slick boring, slurry boring) or dry (auger boring, jack and bore) methods.