This survey observes the sample of 20 sources in the 1.3mm band in three array configurations from the most extended A-array to the compact D-array. The data are complemented by single-dish short-spacing observations with the 30m telescope. The total time at NOEMA is >300hours, at the 30m >20hours. These combined data cover all spatial scales from the resolution limit of ~0.3’’ to the most extended structures. The spectral setup in the 1mm band covers frequencies between 217.15 and 220.79GHz. A subsample of these is observed in the 850µm band around 356GHz with the PdBI in the most extended A-array reaching even higher spatial resolution of ~0.2’’. All 1.3mm data are taken, calibrated and imaged. The analysis is ongoing, updates can always be found on the publication page. The calibrated visibilities and image data are released in a staged fashion corresponding to stages in the analysis of the data. Updates can be found on the publication and data page. As an initial pilot study we observed the high-mass star-forming regions NGC7538IRS1 and NGC7538S. The corresponding papers can be found on the CORE publications page. CORE 1.3mm continuum images of the whole sample (Beuther et al. 2018)