它描述了一艘可以在海上航行几百年的船，这归功于不断的维修和部件的替换。
It describes a ship that remained seaworthy for hundreds of years thanks to constant repairs and replacement parts.
他们发挥了很大的作用，在检查，保养和维修海底设施，并形成了一个先决条件，定位和建设海上单位。
They have played a significant role in inspecting, maintaining and repairing sub-sea installations and have formed a pre-requisite for locating and constructing offshore units.
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