The ocean floor

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More than 80% of the oceans on this planet are yet to be explored, and it's estimated that 99% of the sea floor has yet to be discovered. It took until 2012 for humans to reach the deepest point in the ocean – an area called the Challenger Deep in the Mariana Trench, located in the western Pacific.

The least-explored places on Earth (msn.com)

The ocean floor More than 80% of the oceans on this planet are yet to be explored, and it's estimated that 99% of the sea floor has yet to be discovered. It took until 2012 for humans to reach the deepest point in the ocean – an area called the Challenger Deep in the Mariana Trench, located in the western Pacific.