Two ships start deploying sophisticated equipment to listen for black box

Deep submersible: Workers hoisting back the

PERTH: Two ships – the Australian navy vessel Ocean Shield and the British navy’s HMS Echo – have begun the underwater search for MH370, an operation described as “daunting.”

United States Navy Captain Mark Matthew said the towed pinger lo­­cator (TPL) deployed on Ocean Shield, had to be within 1.8km of the plane’s black box to be able to detect its signals