24.9% - that's the area of ocean floor on Earth that has now been mapped to "modern standards". The new figure was released this morning by Prince Albert of Monaco at the International Hydrographic Organization (IHO) Assembly. An additional 5.4 million sq km of new data - equating to an area twice the size of Argentina - was added in the past year. A good part of this is previously proprietary data being released into @gebcobathymetry @seabed2030 database. Coloured in red is the additional area. When the quest to assemble a comprehensive map of Earth's ocean floor was begun in 2017, the quoted number was just 6%. So, rapid progress has been made, but to put the lack of knowledge about our own planet in context - when the new seamount catalogue was published last month it included over 19,000 newly discovered undersea volcanoes. Think about that - 19,000 mountains on Earth that we previously didn't know about.