通过分析世界海难事故的现状和产生的原因，提出了在开航前和航行中预防发生海难事故的对策。
By analyzing the situation and causes of the shipwreck in the world, the preventing measures in the beginning and during the voyage are put forward in this paper.
当海难事故发生时，由于海洋特殊的环境因素及恶劣的气候，此时的救援工作往往比较困难。
When ocean accidents happen, submarine rescue often has much difficulty because of special environment of ocean and bad climate.
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