Systems, components, and methods relating to subterranean containment
barriers. Laterally adjacent tubular casings having male interlock
structures and multiple female interlock structures defining recesses for
receiving a male interlock structure are used to create subterranean
barriers for containing and treating buried waste and its effluents. The
multiple female interlock structures enable the barriers to be varied
around subsurface objects and to form barrier sidewalls. The barrier may
be used for treating and monitoring a zone of interest.