Crew aboard the Australian Navy ship HMAS Perth watch lines as they are refuelled by HMAS Success during a replenishment at sea, as they continue to search for missing Malaysian Airlines flight MH370 in this picture released by the Australian Defence Force April 10, 2014.
The search area for the missing MH370 plane has narrowed and will be at "a critical juncture" in the next two days, says Malaysia's acting transport minister.
Hishammuddin Hussein said an underwater drone would finish searching the area within the next week.
The Bluefin 21 mini-submarine has so far found nothing after six missions.
Malaysia Airlines flight MH370 went missing in March as it flew from Kuala Lumpur to Beijing carrying 239 people.
The Bluefin is mapping the area of the sea bed within a 10km (six miles) radius of where acoustic signals were detected believed to have come from the aircraft's flight recorder.
It is operating at a depth of more than 4,000m (13,000 feet).
Hussein said it was important to focus on the search on Saturday and Sunday.
"The narrowing of the search for today and tomorrow is at a critical juncture," he said.
"I appeal to everyone around the world to pray and pray hard that we find something to work on in the next couple of days."