It's in international waters, the Chinese have no authority here and in any event Australia is coordinating the search. Ocean Shield is an Australian Defence Fo

It's in international waters, the Chinese have no authority here and in any event Australia is coordinating the search. Ocean Shield is an Australian Defence Force ship (although not grey like your typical warship). http://www.theguardian.com/world/2014/apr/07/mh370-black-box-type-signals-picked-up-twice-by-australias-ocean-shield http://www.theguardian.com/world/2014/apr/07/mh370-black-box... The US has a specialist sub-hunter in the area, and they've made extensive use of P3 and P8 aircraft. I doubt they're terribly sensitive about their ability to find a deliberately pinging object 6000m below the surface. "There are 11 military aircraft, four civilian aircraft and 14 ships taking part in the search on Wednesday." http://www.theguardian.com/world/2014/apr/09/mh370-search-area-drastically-reduced-after-two-more-pings-heard http://www.theguardian.com/world/2014/apr/09/mh370-search-ar...