  We study the longitudinal development of hadronic showers in water and ice
for energies up to 100 EeV. We present results of a hybrid Monte Carlo method
developed for the purpose of simulating those showers. We show
parameterizations of the longitudinal development of hadronic showers in ice
and we investigate the implications of the LPM effect on shower development.
The results obtained are relevant for the detection of high energy cosmic rays
and neutrinos in large scale detectors that use water as Cherenkov medium.
