Sheet piles are thin interlocking steel sheets used to construct a continuous barrier in the ground to retain earth/water. Interlock is typically achieved by clutching the edge of one pile into the previous pile. Vibratory hammers are used to install sheet piles. Id the soil is too hard or dense, an impact hammer can be used to complete the installation. At certain sites where vibrations are a concern, sheets can be hydraulically pushed into the ground using silent pillar. Sheet piles are also a sustainable option since recycled steel is used in their construction and the piles can often be reused.