Police divers testing new sonar equipment found two cars in the lake.

测试新的声纳设备的警方潜水员在湖中发现了两辆汽车。

Using sonar equipment and autonomous underwater vehicles, they navigated trenches, volcanoes and underwater mountains, searching for a debris field up to six kilometers below the surface.

使用声纳设备和自主水下航行器，他们在海沟，火山和水下山脉上航行，寻找在地表以下六公里处的残骸区域。