Mini-sub to dive again after aborting first MH370 search

PERTH, Apr 15 (AFP): A mini-sub hunting missing Flight MH370 was set to sweep the Indian Ocean seabed again Tuesday after cutting short its first mission, as Malaysia vowed to reveal any 'black box' data found.
The unmanned submarine equipped with sonar gear was deployed Monday night from the Australian ship Ocean Shield, which has spearheaded the hunt for the Boeing 777 that vanished on March 8 with 239 people aboard.
But the dive by the Bluefin-21 detected nothing of interest before it automatically aborted the mission after breaching its maximum operating depth, the US Navy said in a statement.
The Australian agency coordinating the search said the Bluefin-21 "exceeded its operating depth limit of 4,500 metres (15,000 feet) and its built-in safety feature returned it to the surface".
The unmanned Autonomous Underwater Vehicle was undamaged and set for a second sonar sweep during the day, weather permitting, officials said.
US Navy Captain Mark Matthews said the vehicle had exceeded programmed operational limits and automatically resurfaced.