"Scientists have made the most precise map yet of the mountains, canyons and plains that make up the floor of Antarctica's encircling Southern Ocean.

Covering 48 million sq km (18.5 million sq miles), this chart for the first time details a new deepest point - a depression lying 7,432m (24,383ft) down called the Factorian Deep.

Knowledge of the shape of the ocean's bottom is essential to safe navigation, marine conservation, and understanding Earth's climate and geological history.

But we still have much to learn.

Vast tracts of terrain have never been properly surveyed."

Jonathan Amos reports for BBC News June 8, 2022. [2]