paula? reporter: kate, we re just waiting for the last couple of planes to come back here to the air base. unfortunately, nothing new or significant for today. at the same time this search is moving into a whole new high gear. today search teams back to square one. debris sighted this weekend apparently leading to dead ends. four orange objects spotted by an awe australian reconnaissance plane and other floating objects that ships recovered turned out to be fishing equipment and dead jellyfish. none of these objects would lead to mh 370. reporter: as the search enters its fourth week the australian prime minister tells cnn they are not giving up. how long can this be sustained realistically? the effort is ramping up. reporter: ten aircraft and ten ships from seven countries among those ships australia s ocean shield prepping to depart