PRJDB3146 16S rRNA gene diversity, Microbial diversity of the Challenger Deep water column. Microbial diversity shown by the 16S rRNA gene of water column from sea surface (0 m) to the trench bottom (10300m) in the Challenger Deep of the Mariana Trench. 16S rRNA gene diversity, Microbial diversity of the Challenger Deep water column. bioproject PRJDB3146 PRJDB3146 true Microbial diversity shown by the 16S rRNA gene of water column from sea surface (0 m) to the trench bottom (10300m) in the Challenger Deep of the Mariana Trench.