No, they headed west in preparation for a turn northwest towards the 'stans. If there had been a mechanical failure, they would have made a U-turn and flown towards Sultan Mahmud (TGG), on the north coast of the Malaysian Peninsula, a distance of only 111 miles. TGG has an 11,417 foot asphalt runway perpendicular to the shore.
After programming in the waypoint, the plane systems caused the plane to rapidly change height. This asphyxiated the passengers and crew.
Why would the plane systems do that? And, if they did, why would it asphyxiate the passengers and crew? The airplane is perfectly capable of flying at FL450 without losing cabin pressurization. And, no, there is no depressurize button in the cockpit.