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In this paper, we present data from the Blind Ultra-Deep HI EnvironmentalSurvey (BUDHIES), which is a blind 21-cm HI spectral line imaging surveyundertaken with the Westerbork Synthesis Radio Telescope (WSRT). Two volumeswere surveyed, each with a single pointing and covering a redshift range of0.164 < z < 0.224. Within these two volumes, this survey targeted the clustersAbell 963 and Abell 2192, which are dynamically different and offer uniqueenvironments to study the process of galaxy evolution within clusters. With anintegration time of 117x12h on Abell 963 and 72x12h on Abell 2192, a total of166 galaxies were detected and imaged in HI. While the clusters themselvesoccupy only 4 per cent of the 73,400 Mpc$^3$ surveyed by BUDHIES, most of thevolume consists of large-scale structures in which the clusters are embedded,including foreground and background overdensities and voids. We present thedata processing and source detection techniques and counterpart identificationbased on a wide-field optical imaging survey using the Isaac Newton Telescope(INT) and deep ultra-violet GALEX imaging. Finally, we present HI and opticalcatalogues of the detected sources as well as atlases of their global HIproperties, which include integrated column density maps, position-velocitydiagrams, global HI profiles, and optical and UV images of the HI sources.

BUDHIES IV: Deep 21-cm neutral Hydrogen, optical and UV imaging data of Abell 963 and Abell 2192 at z $\simeq$ 0.2