... are the static and dynamic geotechnical properties of deep-sea sediment layer in manganese nodule distribution area (Richards and Chaney, 1981). Many data have been collected from the measurements against the samples recovered on board survey vessels with core samplers by the authors. The example results...

... recovering deep-sea sediments while collecting manganese nodules, because the nodules are half buried in the deep-sea sediment layer. Separating the sediments in the mining system as quickly as possible would improve the transportation efficiency of the lift mechanism. Thus it is preferable if most...

... in the deep-sea sediment layer. Separating these sediments in the mining system as quickly as possible improves the transportation efficiency later. This means most of the sediments are e:(dlausted from the nodule collector immediately after collection, at which time they create a plume, are diffused, subside...

... in 20% ethylene glycol. Samples for bacteria study were taken from the chemical samples, which had been sliced into 6 sediment layers in the same way as the biological samples. The sliced sediment samples for bacteria were kept frozen. 182 Table 2 Average abundance ofmctazoan meiofauna at each station...