For those uninitiated in scientific ocean drilling, the previous record was a little over 4 km.

可以告诉没有海洋科学钻探知识的人，先前的纪录是四公里过一点儿。

《柯林斯英汉双解大词典》

It is caused mainly by industrial underwater explosions, ocean drilling, and ship engines.

它主要由工业水下爆炸，大洋钻探，及船舶发动机造成的。

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Ocean Drilling program (ODP) is the largest and worldwide attention attracting international program in the Marine science research.

较为详细地介绍了大洋钻探计划(odp)的科学目标、研究主题及其重要的科学意义。

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Some were on land. Others were on ocean oil-drilling structures.

VOA: special.2009.03.22

And it's true of drilling in the deep ocean, which, as the 2010 disaster in the Gulf of Mexico showed, we obviously haven't figured out quite yet.

CNN: Maybe this oil spill will stick

In Brazil, the story is that we are happy to fund their drilling in the Atlantic Ocean but not willing to drill here (which is completely false, by the way).

FORBES: USA vs the BRICs: Not Third World America Yet

Although the Obama administration recently proposed to allow a modest expansion of offshore drilling in the Arctic Ocean and the Gulf of Mexico as the first concessions since the 2010 Deepwater Horizon spill, Atlantic and Pacific sites will remain off-limits to avoid a controversial decision before the election.

FORBES: The President Should Have Called In Sick