  The energy spectra of hadron cascade showers produced by the cosmic ray muons
travelling through water as well as the muon energy spectra underwater at the
depth up to 4 km are calculated with two models of muon inelastic scattering on
nuclei, the recent hybrid model (two-component, 2C) and the well-known
generalized ector-meson-dominance model for the comparison. The 2C model
involves photonuclear interactions at low and moderate virtualities as well as
the hard scattering including the weak neutral current processes. For the muon
scattering off nuclei substantial uclear effects, shadowing, nuclear binding
and Fermi motion of nucleons are taken into account. It is shown that deep
nderwater muon energy spectrum calculated with the 2C model are noticeably
distorted at energies above 100 TeV as compared to that obtained with the GVMD
model.
