The oil rig's drill penetrated the third level of the salt mine, creating a drain in the lake's floor.

石油钻井平台的钻头穿透了盐矿的第三层，在湖底形成了排水沟。

When a boat uses or lowers its anchor, he wants the rope or the chain that's attached to the anchor to be long enough to reach the bottom of the ocean or the lake floor.

当船使用或放下锚时，他希望连接到锚上的绳索或链条足够长， 以到达海底或湖底。