MH370: Search for elusive 'pings'

This refers to the report, “MH370: Elusive 'pings' keep search in limbo” (April 9). On and off, there are reports that the elusive pings of the black box of the ill-fated plane have been heard. The search has entered the second month but still there has been no seabed search to find out the last resting place of the MH370 flight. This is the most expensive search running into millions of dollars per day by a number of countries like Australia, China, UK and India.
Latest reports say that an Australian ship has relocated more underwater signals and the confirmation may take weeks. The mysterious disappearance of the flight has raised more issues for safety measures. It is a big challenge for modern technology to locate the debris of the plane. An underwater search should have been taken jointly by technologically advanced nations like the USA, China and Russia. Even the space agencies like NASA, European Space Agency and the Japanese one should assist in finding the wreckage of MH370.