Any prelim info on this accident yet?
Unlikely an engine failure, unlikely a failure would have caused a ditch - a C++ with fuel for Yetagon to Kanbauk and 9 Burmese on board should have been 1000 lbs under MTOW, multiply those two remote probabilities together and there isn't much left. With auto floats, push out windows, external rafts, jettisonable doors, Huet training, even a ditching should have been no more drama than the Bristow 332 in Nigeria.
WTH happened?