Beneath the surface of the Southern Ocean, vast volumes of cold, dense water plunge off the Antarctic continental shelf, cascading down underwater cliffs to the ocean floor thousands of meters below.

Unlike large vessels traveling on the ocean's surface or most other vehicles ... nearby objects seen on the charts, as well as water depth. The underwater environment is an unforgiving one.

April 10 (UPI) --Aquatic enthusiasts have an opportunity to join a virtual deep sea expedition with underwater ... proposals to land a water-seeking robot on the lunar surface.

El Niño, a climate phenomenon marked by warming sea surface temperatures in the central ... Ecosystems in the Southern Ocean, the body of water surrounding Antarctica, are under threat from ...