Create annotated diagrams or schematics of waste water disposal systems, hot and cold water supply systems, water lines, and plumbing layouts for plumbing systems and waste water engineering.
There will be a growing need for people who can understand and fix systems -- from computer systems to product distribution systems to plumbing systems.
Nyiragongo has an intricate plumbing system, widespread as the roots of a tree.
Then it's recycled back into the plumbing system.