  This paper proves the sandwich classification conjecture for subgroups of an
even dimensional hyperbolic unitary group $U_{2n}(R,\Lambda)$ which are
normalized by the elementary subgroup $EU_{2n}(R,\Lambda)$, under the condition
that $R$ is a quasi-finite ring with involution, i.e a direct limit of module
finite rings with involution, and $n\geq 3$.
