Five Deeps Expedition to map the Mariana Trench (Pacific Ocean)

The Mariana Trench was surveyed with a Kongsberg EM 124 gondola-mounted to the hull of the 225-foot DSSV Pressure Drop. The survey was conducted over the course of two weeks – April 19th – May 6th, 2019. The data meet the requirements for IHO Special Order standards.研究团队采用安装于225英尺长的DSSV "Pressure Drop"号船体吊舱上的康斯伯格（Kongsberg）EM 124设备，完成了马里亚纳海沟的勘测作业。本次勘测于2019年4月19日至5月6日期间开展，历时两周。所获取的数据符合国际海道测量组织（International Hydrographic Organization, IHO）特等测量标准的要求。