In that part of the world, it could easily be something other than the Air Asia plane.
Everything from WW2 Japanese aircraft to long-lost fishing boats.
War shipwrecks hinder hunt for jet
http://www.thetimes.co.uk/tto/news/world/asia/article4312562.ece?CMP=Spklr-127011278-Editorial-TWITTER-thetimes-20150103-World&linkId=11478251