Damaged planes crash to the ground and destroyed ships sink to the bottom of the sea.

受损的飞机坠毁地面，摧毁的舰船沉落海底。

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An April 25, 2010 satellite photo provided by NASA shows a portion of an oil slick in the Gulf of Mexico, with ships visible at bottom left.

美国宇航局4月25日提供的一幅卫星图上可以明确看到部分浮油已经进入墨西哥湾。图的下方可以清楚地看到数艘船只。

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Endurance cracks may appear in the hull structure at different ship-ages for some ships, especially at the vessel bottom and the longitudinal bone on board side.

有些船舶在不同的船龄阶段，在船体结构上出现疲劳裂纹，特别是在船底、舷侧纵骨中较为突出。

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Mail was usually carried west on ships that sailed around the bottom of South America and then north to California.

VOA: special.2010.04.26

If all goes as planned, the next time you travel to Spain you can gaze on treasures that were not intended for you to see booty, in fact, that was headed to the hands of treasure hunters and other adventurers, as so often happens with valuables rescued from ships lying at the bottom of the sea.

FORBES: Chasing Gold Coins to Spain

Over the centuries, millions of ships sank to the sea bottom, priceless treasures and chests of coins with them.

FORBES: Incredible Shipwrecks Around The World

Specialized ships conduct surveys of the ocean bottom, plotting routes over and around underwater mountains.

WSJ: A Dive Into the Digital Deep