  We present an algorithm to evaluate multiloop Feynman integrals with an
arbitrary number of internal massive lines, with the masses being in general
complex-valued, and its implementation in the \textsc{Mathematica} package
\textsc{SeaSyde}. The implementation solves by series expansions the system of
differential equations satisfied by the Master Integrals. At variance with
respect to other existing codes, the analytical continuation of the solution is
performed in the complex plane associated to each kinematical invariant. We
present the results of the evaluation of the Master Integrals relevant for the
NNLO QCD-EW corrections to the neutral-current Drell-Yan processes.
