NONADIABATIC PROCESSES IN H$^-$ + H$_2$ COLLISIONS A. K. Belyaev and A. S. Tiukanov Department of Theoretical Physics, Pedagogical University of Russia, St. Petersburg, Russia Potential energy surfaces and nonadiabatic couplings between the low-lying singlet states of H$_3^-$ are calculated by means of the diatomics-in-molecule method. The nonadiabatic regions are specified in the three-dimensional space, and it is shown that the nonadiabatic couplings influence remarkably the dynamics of all processes in H$^-$ + H$_2$ collisions. In particular, it is found the simultaneously intersecting four seams of conical intersection.