How would nuclear fallout affect the oceans?

I'm trying to build a setting in which humankind would have no other choice than to live underwater to survive.

Suppose there was a nuclear war in which a huge part of the human population died, and it renders the surface of the earth uninhabitable for several centuries. But people survived because they were conducting an experiment at the time, living in underwater habitats.

How would this fallout then affect the oceans? I'm especially interested in how much the water would be impacted by radiation, if it would affect the edibility of flora/fauna, and if this could possibly cause mutations.

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How would nuclear fallout affect the oceans?

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