To find the change in height, we can subtract the depth reached in the water from the height of the platform.
The height of the platform = 10 meters
The depth reached in the water = 6 meters
Change in height = Height of the platform - Depth reached
Change in height = 10 meters - (-6 meters)
Change in height = 10 meters + 6 meters = 16 meters
Therefore, the change in height is 16 meters.