  The main aim of the ESS$\nu$SB proposal is the discovery of the leptonic CP
phase $\delta_{CP}$ with a high significance ($5\sigma$ for 50% values of
$\delta_{CP}$) by utilizing the physics at the second oscillation maxima of the
$P_{\mu e}$ channel. It can achieve $3\sigma$ sensitivity to hierarchy for all
values of $\delta_{CP}$. In this work, we concentrate on the hierarchy and
octant sensitivity of the ESS$\nu$SB experiment. We show that combining the
ESS$\nu$SB experiment with the atmospheric neutrino data from the proposed
India-based Neutrino Observatory(INO) experiment can result in an increased
sensitivity to mass hierarchy. In addition, we also combine the results from
the ongoing experiments T2K and NO$\nu$A assuming their full runtime and
present the combined sensitivity of ESS$\nu$SB + ICAL@INO + T2K + NO$\nu$A. We
show that while by itself ESS$\nu$SB can have up to $3\sigma$ hierarchy
sensitivity, the combination of all the experiments can give up to $5\sigma$
sensitivity depending on the true hierarchy-octant combination. The octant
sensitivity of ESS$\nu$SB is low by itself. However the combined sensitivity of
all the above experiments can give up to $3\sigma$ sensitivity depending on the
choice of true hierarchy and octant. We discuss the various degeneracies and
the synergies that lead to the enhanced sensitivity when combining different
experimental data.
