Abstract: Based on the systematic HI follow-up survey of 2MASS bright 
galaxies in the Zone of Avoidance (ZoA) with the Nançay Radio Telescope 
(NRT), a prominent galaxy overdensity crossing the Galactic Plane at 
longitudes of ~160° was uncovered. This filamentary overdensity is part 
of the expansive Perseus-Pisces Supercluster (PPS; cz ~ 6000 km/s). Within 
it an X-ray galaxy cluster mostly known as the 3C 129 cluster is embedded. 
The cluster hosts two strong radio galaxies with bent morphologies, which 
is indicative of a rich intracluster medium. Despite it being a potentially 
rich cluster and part of the larger PPS, very little was known about its 
galaxy composition because of the high Galactic dust extinction in the 
ZoA. The Westerbork Synthesis Radio Telescope (WSRT) was used to blindly 
map this ZoA crossing of the PPS in the 21 cm HI-wavelength. The survey 
was conducted through 35 individual pointings observed for a total of 420 
hours, covering a large area of about 9.6 sq.deg and a velocity range of 
approximately cz ~ 2000 - 16000 km/s. Over 200 galaxies were detected in 
HI distributed over various substructures, covering a range of cosmic 
environments within the survey volume. In this talk I will present results 
of this survey and show how the galaxies are distributed and connected to 
the large scale structures above and below the ZoA. I will also present 
properties of the galaxy population in the 3C 129 cluster and give an 
overview of the properties of the HI gas in galaxies situated in various 
environments which range from dense cluster cores, galaxy groups to nearly 
empty voids.