In which year did the ESA Mars Express mission conclusively prove the existence of vast reservoirs of buried water ice near the south pole?

Answer

2004

The European Space Agency’s Mars Express orbiter used radar sounders in 2004 to deliver conclusive proof of large water ice reservoirs buried beneath the planet's south pole.

In which year did the ESA Mars Express mission conclusively prove the existence of vast reservoirs of buried water ice near the south pole?

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