CNN Erin Burnett OutFront April 8, 2014 23:01:00
Desperate. the underwater search has been continuing around the clock. so far, though, nothing. today, australia's ocean shield, the ship that heard pings over the weekend is at the northern end of the defined search area. and at the south, the chinese ship haixun 01 which also believes it heard pings over the weekend, which by definition would be unrelated because they're hundreds of miles apart. the british ship hms echo is joining the search. it's been two days since searchers on the ocean shield believe began at the north came from the plane's black boxes. they have not been able to reacqu...