The possible area it 'landed' in is huge. If it travelled 5000 miles in any direction the area would be almost 80 million square miles. And it could be a mile or so under water
I keep thinking of James Bond movies where a rogue satellite takes them off course and they crash in a jungle, or a huge trawler scoops them out of the sea. After all that, I've read that the searchers have been looking in the wrong place, it appears the 'pings' were from their own search vessels.