Into the blue
Five percent. Only five percent of the ocean has been topographically imaged. This means that 65% of our planet, where you and I live, is unknown. We’ve mapped Mercury and have an incredibly detailed “Idiot’s Guide to the Moon”, complete with ramblers maps which show you how to trek around the international claims of the US and Soviet governments. But comparatively, we know very little of the abyssal plains and continental shelves.