Picture Earth from space. A shimmering blue marble softly glowing with city lights, carved by farmlands and city grids, dominated by vast blue oceans. But beneath the waves lies a complex world, a vibrant underwater city built by coral, alive with color and movement.These underwater cities are more than just beautiful. They protect our oceanceans's health, sheltering over 25% of all marine life at some point in their life cycles. They act as natural breakwaters, softening storm waves before they can crash a ...