  What is the final state of turbulence when the driving parameter approaches
to infinity? For thermal turbulence, in 1962, Kraichnan proposed a so-called
ultimate scaling dependence of the heat transport (quantified by the Nusselt
number $\text{Nu}$) on the Rayleigh number ($\text{Ra}$), which can be
extrapolated to arbitrarily high $\text{Ra}$. The existence of Kraichnan
ultimate scaling has been intensively debated in the past decades. In this
work, using a supergravitational thermal convection system, with an effective
gravity up to 100 times the Earth's gravity, both Rayleigh number and shear
Reynolds number can be boosted due to the increase of the buoyancy driving and
the additional Coriolis forces. Over a decade of $\text{Ra}$ range, we
demonstrate the existence of Kraichnan-like ultimate regime with four direct
evidences: the ultimate scaling dependence of $\text{Nu}$ versus $\text{Ra}$;
the appearance of turbulent velocity boundary layer profile; the enhanced
strength of the shear Reynolds number; the new statistical properties of local
temperature fluctuations. The present findings will greatly improve the
understanding of the flow dynamics in geophysical and astrophysical flows.
