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Design of a Pressure-Holding Sampling Device for Macro Organisms in Hadal Trenches

Developing deep-sea biological resources is of great significance to human development. So far, the inspection and researches of organisms in the deep sea and especially of the hadal trenches are far from sufficient, especially for hadal trenches. Macro organisms sampling technique of hadal trenches is limited by many factors, such as ultra-high hydrostatic pressure at the depth of 11000m, remote control problems, and high cost of investigation and so on. In past researches, abyssal organisms were sampled using non-pressure-holding techniques. It is almost impossible to obtain living organisms by non-pressure-holding sampling. Therefore, it is difficult to conduct researches on living organisms which are sampled in hadal trenches. In this study, a macro organisms pressure-holding sampling device is designed to sample the macro organisms in hadal trenches. The metabolism and physiological characteristics of organisms in normal pressure are obviously different from them in situ. That will make it difficult for biologists to conduct studies on the in situ states of hadal trenches macro organisms. This paper presents a pressure-holding sampling device for macro organisms in hadal trenches. And presents its trapping system in this paper. The mechanical structure was showed in detail in this paper. And the workflow of the sampler was described. Then we calculated the volume of the accumulator. The finite element simulation analysis for the sampling cylinder was performed. This device can be used for in situ sampling of hadal trenches macro organisms. And this device is suitable for whole sea depth sampling.