this is one of only five locations in the world where the sea collects oceanic trash. debris from the water gathers. the concern is this this could be any kind of debris. it might be linked to mh 370. it might not be. authorities are cautious to remind us of this possibility and a lot of hopes and fears are resting on that. it could be the plane. it could be something off a ship and it could just be trash. thank you. joining me now from new york, arnold gordon from columbia university. welcome back. you heard our correspondent there. they are putting a lot of eggs in this basket as far as the search goes. 20 ships and 35 aircraft. can you run through conditions and weather currents, etc. the difficulties for the search