Ifremer, a French research institute which operates the Nautile, said it had signed a contract with the Spanish authorities to check the effectiveness of a previous operation to secure the wreck's leaking hull.

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The operation is obviously the last thing on the check list.

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Cardiff Airport said a snow plough will be in operation but to check with the airport for any schedule changes.

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Consultant Mr Roberts who was overseeing the operation said he was going to check the case notes.

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"When we have an operation that takes place early in the morning, we check to find out what time school gets out (in case) ... we have to process people more quickly, " he said.

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She had had many check-ups with Mr Neale, but he took no action until the emergency operation, she claimed.

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Also thanks to CemexNet, Zambrano can use a laptop or the IBM 770 ThinkPad computer in his office in the ten-story concrete-and-glass Cemex headquarters in downtown Monterrey to check on the daily production, kiln conditions, crushing, bagging and shipping output at any Cemex operation around the world.

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"The main problems are that the airport environment is an alien one and processes such as check-in and security require co-operation with strict guidelines, " Ms Gough said.

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