(Proposal ID) S16B-067 (PI) Yamada, Toru (Proposal Title) Huge volume tomographic survey in the SSA22 proto-cluster with Keck/DEIMOS (Abstract) We conduct wide-field medium-resolution spectroscopy with Keck/DEIMOS toward the SSA22 field in order to reveal (i) the correlation between galaxies and H{i} in the intergalactic medium (IGM) in three-dimensional (3D) space quantitatively and (ii) the circumgalactic medium (CGM) of Lyman break galaxies (LBGs), Lyalpha emitters (LAEs), and Lyalpha blobs (LABs) in various galaxy environments, by using about 800 spectra of LBGs at 2.5