My first thought was they should have Dr. Ballard searching for MH370.
A quick search found this in an AMA he did.
"I offered immediately on hearing of its loss to help in any way possible either advising them on how best to hunt for the airliner or to do it with my own ship and technology but they turned me down. You can't help unless you are invited to help and they clearly wanted to do it themselves. Recently, I met the president of Malaysia Airlines who offered to send me the search data to look at just in case they might have missed something. I am still waiting for the data but don't expect to get it."
https://www.reddit.com/r/history/comments/7eim7p/im_dr_bob_b...