Abstract
In this paper we prove that for suitable sequences of subgroups of Bianchi groups, including the standard exhaustive sequences of a congruence subgroup, and even symmetric powers of the standard representation of $$\mathrm{SL }_2(\mathbb {C})$$ the size of the torsion part in the first integral homology grows exponentially. This extends results of Bergeron and Venkatesh to a case of non-uniform lattices. Our approach is geometric. For odd symmetric powers we obtain a modified statement.
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