The MH370 disappearance remains a mystery

The acoustic ping believed to be from the black box of the ill-fated MH370 made Australia send the mini-submarine drone, Bluefin-21, to scour over 800 square kilometres of the seabed of southern Indian Ocean. But, Bluefin-21 did not find any trace of the aircraft. Thus, the disappointment sparks off outrage, uproar and more speculations, especially among relatives and friends of the 239 victims of the disaster.