并且，石油工业已经开发出可用于海底管道挖槽的遥控船，可以经过改造用来切割矿石，即使这些矿石在1.5千米以下也没问题。
The oil industry has also developed remotely-operated vehicles to make trenches for seabed pipelines, which can be adapted for cutting ore, even though it may lie much deeper, at, say, 1.5km down.
他们用一切办法开发海底石油。
他们用了一切方法来开发海底石油。
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