1. Synonyms for Bedrocks include bases, bottoms, foundations, substrata, underpinnings, beds, substructures, grounds, understructures and footings

2. Unlike earlier Amphitheaters, the Colosseum featured elaborate basement amenities, including animal cages and mechanical elevators, as well as a complex system of vaulted, concrete substructures

3. Oil well drilling machinery: oilfield drilling rig equipment, namely, crown blocks, traveling blocks, deadline anchors, masts, derricks, substructures, skid bases, draw works, mobile rigs, rig carriers, rig trailers, top drives, rig skidding hydraulic jacks, controls and clamps

4. Caisson foundation is the prefabricated hollow substructures designed to be constructed on or near the surface of the ground, sunk to the desired depth and then filled with concrete, thus ultimately becoming an integral part of the permanent structure, it is also known as pier foundation.