Field layout of the NIRSpec Deep-HST observations presented in this paper. The green rectange is the region covered by the original HST/ACS Hubble Ultra Deep Field. The red rectangle is the smaller area covered in the Ultra Deep HST/WFC 3 imaging. The background image is the NIRCam F200W from JADES, except for the region to the right of the blue line which has not yet been observed by NIRCam; we show in this region the HST/WFC 3 from GOODS-South/CANDELS in blue. The short red lines denote the five-shutter ($\approx 2_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}6$) extent observed (three open shutters each target per observation, nodded by ±1 shutter for background subtraction). The four quadrants of the NIRSpec MSA are clearly visible. More detailed views of each quadrant with the target ID numbers marked are shown in Figures 3 and Figures D.1, D.2 and D.3, which also show the sub-set of targets with grating spectra. The yellow scale bar at the bottom left is 1 arcmin in length.