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Everett's many-worlds or multiverse theory is an attempt to find analternative to the standard Copenhagen interpretation of quantum mechanics.Everett's theory is often claimed to be local in the Bell sense. Here, we showthat this is not the case and debunk the contradictions by analyzing in detailthe Greenberger--Horne--Zeilinger (GHZ) nonlocality theorem. We discuss andcompare different notions of locality often mixed in the Everettian literatureand try to explain the nature of the confusion. We conclude with a discussionof probability and statistics in the many-worlds theory and stress that thestrong symmetry existing between branches in the theory prohibits thedefinition of probability and that the theory cannot recover statistics. Theonly way out from this contradiction is to modify the theory by adding hiddenvariables \`a la Bohm and, as a consequence, the new theory is explicitlyBell-nonlocal.

An Elementary Proof That Everett's Quantum Multiverse Is Nonlocal: Bell-Locality and Branch-Symmetry in the Many-Worlds Interpretation