PERTH, Australia (AP) - Crews searching for the missing Malaysia Airlines plane have sent a robotic submarine deep into the Indian Ocean for the first time today after failing to pick up any possible pings from the plane's black boxes for six days.
The autonomous sub can create a three-dimensional sonar map of any debris on the seafloor.
Meanwhile, officials are investigating an oil slick not far from the area where the last underwater sounds were detected.
Crews have collected a sample of the oil and are sending it back to Australia for analysis, a process that will take several days. The oil does not appear to be from any of the ships in the area.