*Koichi Iijima^1,2, Yuka Masaki^1,2, Blair Thornton³, Akira Usui⁴, Keisuke Nishi⁵, Katsuhiko Suzuki^1,2, Kazuya Kitada^1,2, Junji Kaneko^1,2, Cruise members of YK15-15, Cruise members of NT13-13, Cruise members of KR15-E01, Cruise members of KR16-01 (1.Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 2.Project Team for Development of New-generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, 3.Institute of Industrial Science, The University of Tokyo, 4.Science Research Center, Kochi University, 5.Graduate school of Integrated Arts and Sciences, Kochi University)