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We present a study of a large filamentary structure at z~0.73 in the field ofthe COSMOS survey, the so-called COSMOS Wall. This structure encompasses acomprehensive range of environments from a dense cluster and a number of galaxygroups to filaments, less dense regions, and adjacent voids. It thus provides avaluable laboratory for the accurate mapping of environmental effects on galaxyevolution at a look-back time of ~6.5 Gyr, when the Universe was roughly halfits present age.  We performed deep spectroscopic observations with VIMOS at VLT of a K-bandselected sample of galaxies in this complex structure, building a sample ofgalaxies complete in galaxy stellar mass down to a lower limit of log(M/M_sun)~9.8, which is significantly deeper than previously available data. Thanks toits location within the COSMOS survey, each galaxy benefits from a wealth ofancillary information.  In this paper we detail the survey strategy and weighting scheme adopted toaccount for the biases introduced by the photometric pre-selection of ourtargets. We present our galaxy stellar mass and rest-frame magnitudes estimatestogether with a group catalog obtained with our new data and their membergalaxies color/mass distribution.  Owing to to our new sample we can perform a detailed, high definition mappingof the complex COSMOS Wall structure. The sharp environmental information,coupled with high quality spectroscopic information and rich ancillary dataavailable in the COSMOS field, enables a detailed study of galaxy properties asa function of local environment in a redshift slice where environmental effectsare important, and in a stellar mass range where mass and environment driveneffects are both at work.

An high definition view of the COSMOS Wall at z~0.73