How deep could the currently estimated deep subsurface liquid water reservoir cover the entire planet if its volume were spread across the surface?

Answer

1 to 2 kilometers deep

This massive, pressurized, deep reservoir is estimated to hold enough water to potentially cover the entire planet in an ocean measuring 1 to 2 kilometers deep.

How deep could the currently estimated deep subsurface liquid water reservoir cover the entire planet if its volume were spread across the surface?
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