  Galaxy clusters are some of largest structures in the universe. These very
dense environments tend to be home to higher numbers of evolved galaxies that
what is found in lower density environments. It is well known that dense
environments can influence the evolution of galaxies through the removal of the
neutral gas (HI) reservoirs which fuel star formation. It is unclear which
environment has a stronger effect: the local environment (i.e. the substructure
within the cluster), or the cluster itself. Using the new HI data from the
Westerbork Coma Survey, we explore the average HI content of galaxies across
the cluster comparing galaxies that reside in substructure to those that do
not. We apply to the Dressler-Shectman test to our newly compiled redshift
catalogue of the Coma cluster to search for substructure. With so few of the
Coma galaxies directly detected in HI, we use the HI stacking technique to
probe average HI content below what can be directly detected. Using the
Dressler-Shectman test, we find 15 substructures within the footprint of the
Westerbork Coma Survey. We compare the average HI content for galaxies within
substructure to those not in substructure. Using the HI stacking technique, we
find that the Coma galaxies (for which are not detected in HI) are more than
10--50 times more HI deficient than expected which supports the scenario of an
extremely efficient and rapid quenching mechanism. By studying the galaxies
that are not directly detected in HI, we also find Coma to be more HI deficient
than previously thought.
