Abstract
A Deep Diving Simulator（DDS）was completed in June, 1985, at MSDF Undersea Medical Center in Yokosuka. Main purposes of DDS are to educate and train deepsea divers and personnel for saturation diving operation, to conduct research related underwater physiology and psychology, and to study human factor engineering of diving equipments. The DDS comprises a hyperbaric chamber complex, main control room, life support and environmental control system, high pressure gas storage area and supply system, and Environmental-Biological Information Processing System （EBIPS）. The hyperbaric chamber complex consists of two deck decompression chambers（DDC）, center lock（CL）that connects two DDCs, personnel transfer capsule（PTC）, and wet pot（WP）that is separated from DDCs. The PTC transfers three divers from the CL to the WP for excursion diving. The EBIPS is composed of vital sign, body heat loss and high pressure nervous syndrome （HPNS）section, and provides on-line analysis of ongoing measurement data as well as data logging for future study. The EBIPS was run for the first time during a 100 meters simulated saturation diving in October, 1985. Although the system has not been completed in computer programming, its function seemed to be satisfactory.
