It should be "has done". This is dictated by the "has never happened" sense, irrespective of the sequence of tenses. We use the present perfect when talking about something that has not happened over a period of time (or ever) stretching up to the present.
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It should be "has done". This is dictated by the "has never happened" sense, irrespective of the sequence of tenses. We use the present perfect when talking about something that has not happened over a period of time (or ever) stretching up to the present. E.g.:
Nobody has seen her for six weeks.
cat desk They have done something that no other team has done.
In the sentence above, I read They have done something as a clause in which an action/event is done in the unspecified time in the past, and that no other team has done as a clause in which connection with the present (now) is implied.