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[Black Aeronaut]

A commet's nucleus is a drop in the bucket. On Earth we get iceburgs that size (though with some dismay). To get the kind of water you'd want,
you'd want to take something like the entirety of Earth's polar ice caps. That'll put some real oceans on Mars.

Really, it's going to be a long and tedious process to get oceans on Mars because most of the water escaped with the atmosphere (which is going to have to
be the first problem we lick before making oceans).