The main features of geological structures of ocean rift zones based on results of studies of the P.P. Shirshov Institute of Oceanology with use of manned submersibles "Pisces" are under consideration in the book. Multiyear experience of geological exploration in rift zones with the use of these submersibles is summarized. Methodology of underwater operations is described. The main structural features of the Red Sea and Gulf of Aden rifts as well as the rift zone of the Reykjanes Ridge are considered.

Supplement to: Monin, Andrey S; Bogdanov, Yury A; Zonenshain, Lev P; et al. (1985): Podvodnyye Geologicheskie Issledovaniya s Obitaemykh Apparatov (Underwater Geological Research from Manned Submersibles). Moscow, Nauka Publ., 232 pp.