The desire for construction of offshore harbour structures such as sea berths has been increased. However methods of investigation for obtaining the fundamental in formation on soil properties at the construction site in the deep sea have not been fully established yet.
　These problems may not be solved only by modifying of extending the present investigation methods.
　For the purpose of establishing the suitable investigation methods, litertureinbestigation has been conductor on boring equipments and methosds, which are used in the very aeed sea, for example, for the survey of petroleum resourced. In this paper, a part of these works is rublished as the first report.