They had to use ROVs, remote operated vehicles, in order to find this thing, because of its depth.

他们不得不使用远程操作移动工具，来找到这个东西，因为它的深度。

The instruments were deployed on the seafloor by remoted operated vehicle as part of the Mars seafloor observatory test bed Located at depth of 3,000 feet in Monterey bay.

作为位于蒙特利湾 3,000 英尺深度的火星海底观测台试验台的一部分，这些仪器通过遥控车辆部署在海底。