They were detected at depths of more than a kilometre in the sea.它们是在海面下超过一公里深的地方被检测出来的。The tunnel goes deep under the ground.隧道在地下很深的地方。The ship's mast finally disappeared into the watery depths.船桅最终消失在水下很深的地方。They go down to great depths below the surface.他们下到了地表以下很深的地方。