kuala lumpur malaysia negotiate u.s.-based seabed exploration firm ocean infinity resume search malaysia airlines mh370 vanish three years ago southern indian ocean 239 people aboard disappearance aircraft en route beijing kuala lumpur rank among world great aviation mysteries australia china malaysia end fruitless 200-million 157-million search effort january week malaysia say receive proposals continue search ocean infinity dutch firm fugro unidentified malaysian company ocean infinity beat competition government begin negotiations malaysia deputy transport minister aziz kaprawi say thursday yes negotiate ocean infinity agreement finalise tell reuters decline comment potential reward plane discovery offer open basis honor aircraft find firm make offer no-cure no-fee basis accord letter see reuters send passengers families thursday australia china inform negotiation process australia informally agree malaysia choice aziz say still discussion china add decline elaborate china possible concern australian chinese authorities immediately respond reuters request comment ocean infinity could confirm award contract good progress make spokesman say statement calvin shim whose wife one mh370 crew say relieve authorities consider resume search grateful step finally officially take tell reuters text message relatives others board voice concern lengthy talk however families tell ocean infinity offer march say grace nathan lawyer whose mother aboard best weather search spring summer say nathan worry lose window take long decide malaysia talk u.s. firm ocean infinity resume mh370 search