Hi @vinsub,
That said, if you only care about sending the values to QGC (e.g. for manual control), and not to the autopilot (e.g. for depth-hold mode and similar) then it may work to send SCALED_PRESSURE2 MAVLink messages (e.g. via a Python program) to the topside. That will only work if there’s not also an existing depth sensor (e.g. Bar30/Bar100) connected to the flight controller - otherwise the autopilot and your Python program will be fighting over which depth gets reported to QGC / QGC will be flickering between the different values.