MH370 search: Mini-sub Bluefin-21 tries again after first hunt aborted

PERTH: A mini-sub hunting for Malaysian jet MH370 prepared to make a second mission to the remote Indian Ocean seabed Tuesday after aborting its first search as it encountered water deeper than its operating limits, officials said. 

The unmanned submarine loaded with sonar to map the ocean floor deployed Monday night from the Australian ship Ocean Shield, which has spearheaded the hunt for the Boeing 777 that vanished on March 8.