We are as confident as we can be. We have examined every possible alternative interpretation of our data, but the only explanation consistent with the data is that the strong reflections observed by the radar come from distinct liquid bodies of water. The fact that we have obtained the same results using completely different data analysis methods makes us quite confident that the radar anomalies are caused by the presence of extended bodies of liquid water.
What more evidence is needed to prove this discovery for sure?
The silver bullet for this would be in-situ seismics (to be deployed with lander, rovers), which would allow not only to detect the top of such salty water bodies (radar cannot penetrate below the liquid interface), but also their bottom and geometry. Further, orbital radar data through new missions could shed more light on the presence of the other water bodies, perhaps, but rover-based geophysics (seismics, in particular) would be desirable.
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