It's difficult to provide a concrete answer to this
question because we aren't actively monitoring the presence of life and the presence of
UV radiation at every point on the Earth. We also haven't fully explored the Earth to
the point that we can say we know exactly where life does and does not exist. There is
also no guarantee that any point on Earth is completely free of UV radiation at all
times.
However, we can safely assume that there are at
least two environments that would be significantly shielded from UV radiation; the deep
ocean, and underground, such as in caves or in the Earth itself. We know that bacteria
and archaea can exist at extreme temperatures and depths, and explorations of the deep
ocean have shown that life does exist there, albeit sparsely.
It should be noted that, in an evolutionary context, life
probably did not originate in these locations, but expanded into them after developing
in a location with more exposure to UV radiation.
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