Many natural and artificial processes rely on tiny tubes, such as blood vessels with diameters from 25 mm to a few micrometres. If we can investigate such tiny tubes, we can check if they are starting to break, clog or corrode. This could both improve health and save huge resources in, for example, food or energy production. If we can create a small autonomous vessel that can monitor this inside the tube, it would open the door to early, non-invasive diagnostics.
