Expert: Black Box Batteries Likely Dead

(Sarasota, FL) -- One expert believes the black-box batteries of a missing Malaysian airliner are dead. Jeff Densmore designs and develops underwater beacons. He told CNN's "State of the Union" the lack of pings shows the black-box batteries have run out. However, the pings have narrowed the search area. Twelve planes and 14 ships are expected to take part in today's search in a remote area of the Indian Ocean.