That's the problem lawmakers are wrestling with amid hearings and federal investigations of the Upper Big Branch mine blast in West Virginia and the BP oil rig collapse in the Gulf of Mexico.

在西弗吉尼亚州煤矿爆炸和英国石油公司在墨西哥湾的钻井平台漏油事故的听证会和联邦调查中，这就是国会议员们正在努力解决的问题。

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The first blast, believed to have been caused by methane, hit the Raspadskaya mine just before midnight on Saturday.

拉斯·帕达·斯卡雅煤矿的第一次爆炸发生于周六午夜，据信是由甲烷引起。

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Crews did start down into the mine yesterday morning, but they had to come back out because the air quality got worse and threatened a new blast.

昨天早上，搜救人员就已经到达矿井下，但是由于空气质量越来越差，可能会导致新的爆炸，他们不得不出来…

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At least one vehicle at the front of the convoy was then hit by a land-mine blast before as many as 200 suspected rebels opened fire, they added.

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Along with jammers, troops use air surveillance, robots, blast-resistant vehicles and mine rollers as countermeasures.

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Specialist mine rescue crews, ambulances and helicopters rushed to the mine as soon as the blast was reported.

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