2017 – RV "Tansuo-1" –– CAS' Institute of Deep-sea Science and Engineering sponsored "Tansuo-1" return to the Challenger Deep 20 January - 5 February 2017 (cruise TS03) with baited traps for capture of fish and other macrobiology near the Challenger and Sirena Deeps. On 29 January they recovered photography and samples of a new species of snailfish from the Northern slope of the Challenger Deep at , newly designated "Pseudoliparis swirei". They also placed four or more CTD casts into the "central" and "eastern" basins of the Challenger Deep, as part of the World Ocean Circulation Experiment (WOCE).