On Friday, 11 planes and 12 ships were continuing the surface search across about 52,000 square kilometers (20,000 square miles) of ocean. The U.S. alone has flown 35 missions, racking up 319 hours of flight time over nearly 450,000 nautical miles of ocean, according to the Seventh Fleet.
Angus Houston, who is heading up the search effort, said earlier this week that the hunt for floating debris would be ending within days, because it is unlikely that anything will be found. But the search coordination center said the effort would continue into next week, more than six weeks after the plane vanished.
Malaysia's defense minister, Hishamuddin Hussein, confirmed that the search would continue through the Easter weekend, but acknowledged that officials would have to rethink their strategy at some point if nothing is found.
"There will come a time when we need to regroup and reconsider, but in any event, the search will always continue. It's just a matter of approach," he said at a news conference in Kuala Lumpur on Thursday.
The U.S. Navy's unmanned sub cut short its first mission on Monday because it exceeded its maximum operating depth of 4,500 meters (15,000 feet). Searchers moved it away from the deepest waters before redeploying the sub to scan the seabed with sonar to map a potential debris field.
But the search coordination center said Thursday that officials are now confident the sub can safely go deeper than was thought, allowing it to cover the entire search area, which has been narrowed based on further analysis of the four underwater signals previously detected.
