The impact of a weak south pole on thermal convection in Enceladus' ice shell

► We present 3D spherical models of convection in Enceladus' ice shell. ► We implement a mechanically weak lithosphere within Enceladus' SPT. ► We find vigorous convection in the ice underneath the SPT. ► Stagnant lid convection or no convection occurs elsewhere over the satellite. ► Our models explain high heat flow, intense tectonism, and young ages in SPT.