Thought this article was interesting, talks about the difficulty in finding the Air France flight that crashed over Atlantic. Enjoy!

Earlier this week, investigators said they had located pieces of
the plane in the southern Atlantic Ocean, which might have given them
clues to the origin of Air France Flight 447's crash. But on Thursday, Brazilian officials said what they had found was nothing more than run-of-the-mill ocean trash. Much of the ocean trash is plastic, which means it won't go away
for hundreds of years, if ever. And the problem has gotten so bad that
soupy "garbage patches" have developed in several locations, called
gyres, where ocean currents swirl. One of them is estimated to be the size of Texas.

http://www.cnn.com/2009/TECH/science/06/05/marine.debris.crash/index.html