Missing MH370: Indian Ocean search a daunting challenge

SYDNEY: The southern Indian Ocean, where investigators suspect the missing Malaysia Airlines Flight MH370 may have come down, is one place where a commercial airliner can crash without a ship spotting it, a radar plotting it - or even a satellite picking it up.

The empty expanse of water is one of the most remote places in the world and also one of the deepest, posing potentially enormous challenges for the international search effort now refocusing on the area, one of several possible crash sites.