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We find the height of the third fission barrier $B_{III}$ and energy of thethird minimum $E_{III}$ in $^{232}$Th using the macroscopic - microscopicmodel, very well tested in this region of nuclei. For the first time it is doneon an 8-dimensional deformation hypercube. The dipole distortion is includedamong the shape variables to assure that no important shapes are missed. Thesaddle point is found on a lattice containing more than 50 million points bythe immersion water flow (IWF) method. The shallow third minimum,$B_{III}-E_{III}\approx 0.36$ MeV, agrees with experimetal data of Blons et al.This is in a sharp contrast with the status of the IIIrd minima in$^{232-236}$U: their experimental depth of $\geq3$ MeV contradicts allrealistic theoretical predictions. We emphasize the importance of repeating theexperiment on $^{232}$Th, by a technique similar to that used in the uraniumnuclei, for settling the puzzle of the third minima in actinides.

8Dim calculations of the third barrier in $^{232}$Th and a conflict between theory and experiment on uranium nuclei