I didn't say all plane wreckage floats. I said a surprising percentage of it will. And of course it could have been swept away by currents, but the fact remains that it will show up somewhere eventually. I know you're angry that your armchair physics knowledge has been challenged, but let's be real here. Airplanes generally don't disintegrate into a fine powder due to mechanical reasons. And by generally, I mean never. Even bombs/missiles leave a mess that should have been detected by now.