"There have been no further contacts with any transmission and we need to continue (searching) for several days right up to the point at which there's absolutely no doubt that the batteries will have expired," Houston said. It has sent both its Towed Pinger Locator, which this week picked up signals which may be from the missing plane's cockpit data recorders, and a Bluefin-21 autonomous underwater vehicle. "We have at least several days of intense action ahead of us." A FINANCIAL RECKONING 
 
 Australian Prime Minister Tony Abbott, whose country is leading the search, and his Malaysian counterpart, Najib Razak, have repeatedly said the cost of the search is not an issue.
– As searchers listen for pings in the Indian Ocean that might help them find the missing Flight 370, Reuters assesses the cost of the hunt after a month and finds that it's on track to become the most expensive search in aviation history. Reuters figures that the militaries of Australia, China, the US, and Vietnam have spent $44 million already, about the amount spent in the two-year search for the Air France jet that went missing in 2009. The $44 million total doesn't take into account civilian aircraft or the cost of accommodating hundreds of intelligence analysts and other personnel worldwide. Add those expenses in, and the total is in the "hundreds of millions of dollars." Australia is leading the search and has borne about half the costs so far, though Prime Minister Tony Abbott said the nation may ask others to defray its expenses later. "At some point, there might need to be a reckoning, there might need to be some kind of tallying, but nevertheless we are happy to be as helpful as we can to all the countries that have a stake in this," he said. The Pentagon estimates that the US has spent $3.3 million so far. With no sign of the pings in two days, the search could drag on and on, reports AP. Australia plans to release a submersible to scan the ocean floor, but it hopes to get a more precise location before doing so.