  We present numerical evidence of how three-dimensionalization occurs at small
scale in rotating turbulence with Beltrami (ABC) forcing, creating helical
flow. The Zeman scale $\ell_{\Omega}$ at which the inertial and eddy turn-over
times are equal is more than one order of magnitude larger than the dissipation
scale, with the relevant domains (large-scale inverse cascade of energy, dual
regime in the direct cascade of energy $E$ and helicity $H$, and dissipation)
each moderately resolved. These results stem from the analysis of a large
direct numerical simulation on a grid of $3072^3$ points, with Rossby and
Reynolds numbers respectively equal to 0.07 and $2.7\times 10^4$. At scales
smaller than the forcing, a helical wave-modulated inertial law for the energy
and helicity spectra is followed beyond $\ell_{\Omega}$ by Kolmogorov spectra
for $E$ and $H$. Looking at the two-dimensional slow manifold, we also show
that the helicity spectrum breaks down at $\ell_{\Omega}$, a clear sign of
recovery of three-dimensionality in the small scales.
