Shafts are the doorways to the underground; its design and construction are key to the successful completion of any tunneling project. For each tunnel have two shafts (Launching & Receiving) to be constructed: 

• Launching shaft: mainly used to setup the tunneling equipment and consider as the starting point.
• Receiving Shaft: used for machine head recovery upon the completion of crossing and consider as the end point.

The method of shafts construction depends in the different parameters such as:

• Shaft diameter.
• Shaft depth.
• Ground nature.
• Presence of the water table.

STCC has executed shafts in different methods in a high level of quality, the following are the methods of construction used to construct the shafts; 

• Sheet piles.
• Cement block method.
• Bored Cast-In-Situ Secant Piles.
• Caisson/ Sinking Method.