Extracted region of the g-band VST mosaic (0.945 × 0.776 deg ∼0.84 × 0.69 Mpc) of the Hydra I cluster, which corresponds to ∼0.4 R_vir. The brightest galaxy members (m_R ≤ 15 mag) from the Christlein & Zabludoff (2003) catalogue are marked as red diamonds. The BCG, NGC 3311, is marked with the green cross. The large blue circles indicate the galaxies whose heliocentric velocity is comparable to or larger than the escape velocity of the cluster in phase-space (see Sect. 6). The orange symbols mark the position of the two brightest foreground stars in the field, which were subtracted from the original mosaic (see Sect. 4.3). As expected, some artefacts are still present close to the subtracted stars, which are caused by non-symmetric scattered light and the haloes of those two brightest stars. N is up, and east (E) is on the left.