We propose a new bottom −sampler robot for core sampling operations in this paper , Conventionallyl penetration oF a sampler into soil is done by gravity in many cascs . Another approach is use of large unClerwater robots with core sampler mechanisms . In both of them , the robot tends to be heavy. This paper describes the implementation of an undcrwater robot with soil sampling function obtained by thrusters . In the proposed robot , the robot has neutral buoyancy , and positioning of thc sampling site and penetration of the sampler arc pcrformed by thrusters . Key Words : Under water robot , Soil sampling , Neutral buoyancy
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