  Supersymmetric models often predict a lightest superpartner (LSP) which is
electrically charged and stable on the timescales of collider experiments. If
such a particle were to be observed experimentally, is it possible to determine
whether or not it is stable on cosmological timescales? Charged, stable
particles are usually considered to be excluded by cosmological arguments
coupled with terrestrial searches for anomalously heavy water molecules. But
when the cosmology is significantly altered, as can happen in models with large
extra dimensions, these arguments are in turn significantly weakened. In this
paper we suggest an alternate way to use searches for superheavy water to
constrain the lifetimes of long-lived, charged particles, independent of most
cosmological assumptions. By considering SUSY production by cosmic rays in the
upper atmosphere, we are able to use current bounds on superheavy water to
constrain the mass scale of squarks and gluinos to be greater than about 230
GeV, assuming a stable, charged LSP. This bound can be increased, but only by
significantly increasing the size of the initial water sample tested.
