[en] The derivation of the sea level muon spectrum and primary nucleon spectrum from a measured undersea -spectrum in DUMAND requires detailed knowledge of the non-QED muon interaction processes. An uncertainty in the photonuclear cross-section give an error bar of approximately 0.15 for the meson production spectrum. A Monte Carlo study of DUMAND muons has been performed to calculate i) energy loss and its fluctuations, ii) number of interactions per muon passage, iii) rates of interactions. Special attention has been put to the high energy transfer events of the bremsstrahlung and nuclear interaction type processes. These events were treated with the aim to get experimental information on the total inelastic cross-section and its energy behaviour