On 2 September 2019, a Boeing 777-300 failed to continue climbing following a night takeoff from Shanghai when the autopilot was quickly engaged. When it began to descend, inaction after several EGPWS DON’T SINK Alerts was followed by an EGPWS ‘PULL UP’ Warning. Recovery then followed but only after autopilot re-engagement led to another descent did the crew recognise that a single character FMS data input error was the cause. The Investigation was concerned that both pilots simultaneously lost situational awareness of the low aircraft altitude during the event and noted both procedural non compliance and sub optimal crew interaction.