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steam engine was used only for powering the dredge. [ ] it was loaded with specimen jars, filled with alcohol for preservation of samples, microscopes and chemical apparatus, trawls and dredges, thermometers, barometers, water sampling bottles, sounding leads , devices to collect sediment from the sea bed
bottom dredges, open water trawls and serial water temperature observations were taken. [ ] about new species of marine life were discovered. the scientific work was conducted by wyville thomson , john murray , john young buchanan , henry nottidge moseley , and rudolf von willemoes-suhm . frank evers bed...
https://en.wikipedia.org/wiki/Challenger_expedition