  Our Galaxy blocks a significant portion of the extragalactic sky from view,
hampering studies of large-scale structure. This produces an incomplete
knowledge of the distribution of galaxies, and, assuming galaxies trace mass,
of the gravity field. Further, just one unrecognized, nearby massive galaxy
could have large influence over the Milky Way's motion with respect to the
Cosmic Microwave Background. Diligent surveys in the optical and infrared
wavebands can find galaxies through moderate Galactic gas and dust, but close
to the Galactic Plane, only radio surveys are effective. The entire northern
Zone of Avoidance is being searched at 21 cm for galaxies using the Dwingeloo
25-m telescope. A shallow search for nearby, and/or massive galaxies has been
completed, yielding five objects. Two of these galaxies were previously
unknown, and although they are not likely members of the Local Group, are part
of the nearby Universe. A deeper search continues, which will produce a
flux-limited catalog of hidden galaxies. This portion of the survey is
one-third complete, and has detected about 40 objects to date. Based on present
understanding of the HI mass function, the complete survey should uncover 50 -
100 galaxies.
