Planet
What percentage of Earth's oceans have been explored?
~20% mapped
What percentage of Earth's oceans have been explored?
Scientists estimate that about 20–25% of the ocean floor has been mapped with meaningful resolution. Only about 5% has been directly observed or explored. The ocean covers 71% of Earth's surface and averages 3.7 km deep — making it the largest unexplored region on the planet.
Source: NOAA; Seabed 2030 Project