Ah ok that makes sense
It also sort of explains how easy it would be for earth's water to have come from asteroid impacts.
https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/...
Here's an article showing comparisons to various moon ice.
https://www.businessinsider.com/earth-water-ice-volume-versu...
I don’t think the big bubble includes the ocean.
EDIT: Corrected km to meters, as comment below points out.