hand-drawn 2D explainer cartoon illustration, thick clean black outlines, simplified readable forms, flat cel-style colors, soft minimal shading, expressive human characters, clean educational YouTube illustration, simple depth, clear focal hierarchy, no photorealism, no 3D rendering. Centered mini-scene composition on a clean white background. Industrial high-capacity water pumps on a metal platform actively lowering the dark water line in a flooded cavern, revealing sharp tips of giant translucent selenite crystals emerging from receding water, occupying central 60% of frame. Wide white negative margins, bright safety yellow pump housing, flat cel colors, bold outlines, no photorealism, no 3D, no text.
