One more theory from an experienced pilot's pov is much believed over last week Mudraji. Please have a look here:
http://www.wired.com/autopia/2014/03/mh370-electrical-fire/
But, I dont find this theory much credible. Two things that have been bugging me in this mystery are: Max. passengers of this jinxed flight are Chinese nationals but China seemed to be very calm in this tragedy. I mean when in any tragedy US or other countries' nationals are involved, the respective nation creates quite a huge tumult but dunno why Chinese govt. seemed so much at peace and other thing is, not only developed coutries like US, Japan, France etc. but all asian countries too have stealth submarines and other patrolling boats etc. As you mentioned, it's not possible to mislead their defense systems. So, I dont just buy that, the plane crashed in Southern Indian Ocean and nothing could detect it. After all it was a boeing jumbo jet - when it crashed and sunk, it must have created at least some noticeable turbulence. So many spy satellites are there and radars too. Malaysian PM himself had admitted that some countries' radars noticed the plane but they are not allowed to disclose which radars. Maybe those countries dont wish to disclose at strategic locations where their spies are deployed. Moreover, the debris located is also "suspected" not "confirmed". Could it be possible that the plane didnt vanish in ocean but was hijacked and the passengers were killed some other way but to avoid public wrath, the Govts are hiding the facts and projecting "crashed in sea" theory 😕 God knows what's the truth... but feeling really really sad for the poor passengers' families 😭 What they must be going thru, can't dare imagine 😭
Poor passengers and their families!