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The main aim of the ESS$\nu$SB proposal is the discovery of the leptonic CPphase $\delta_{CP}$ 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 allvalues of $\delta_{CP}$. In this work, we concentrate on the hierarchy andoctant sensitivity of the ESS$\nu$SB experiment. We show that combining theESS$\nu$SB experiment with the atmospheric neutrino data from the proposedIndia-based Neutrino Observatory(INO) experiment can result in an increasedsensitivity to mass hierarchy. In addition, we also combine the results fromthe ongoing experiments T2K and NO$\nu$A assuming their full runtime andpresent the combined sensitivity of ESS$\nu$SB + ICAL@INO + T2K + NO$\nu$A. Weshow that while by itself ESS$\nu$SB can have up to $3\sigma$ hierarchysensitivity, the combination of all the experiments can give up to $5\sigma$sensitivity depending on the true hierarchy-octant combination. The octantsensitivity of ESS$\nu$SB is low by itself. However the combined sensitivity ofall the above experiments can give up to $3\sigma$ sensitivity depending on thechoice of true hierarchy and octant. We discuss the various degeneracies andthe synergies that lead to the enhanced sensitivity when combining differentexperimental data.

Enhancing the hierarchy and octant sensitivity of ESS$\nu$SB in conjunction with T2K, NO$\nu$A and ICAL@INO