"Accordingly, the underwater search for MH370 has been suspended. The decision to suspend the underwater search has not been taken lightly nor without sadness." Even then, the search zone was enormous and located in one of the most remote patches of water on earth — 1,100 miles off Australia's west coast. For years, search crews painstakingly combed the search area in several ships, largely pinning their hopes on towfish, small vessels equipped with sonar that sent information back to the boats in real-time. The search zone shifted multiple times as investigators refined their analysis, all to no avail.

Source: Fox News January 17, 2017 06:32 UTC