Teams searching for the missing Malaysian plane say they will wait for further contact with signals picked up over the weekend before using a submersible robot down to search for debris.
An Australian ship has heard signals that officials said could be consistent with black box flight recorders.
However, it has not been able to reacquire them since Sunday. Australian officials said it was key to re-find the signals before using a submersible robot in a search for wreckage.
Flight MH370 went missing on 8 March with 239 people on board.