HSE LTI Days - Health, Safety and Environment Lost Time Incident Days, How long has it been since there was an LTI?

健康、安全、环保—主要是相关事故发生天数，以及上次发生事故距今天数。

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"At the time of the accident, the Deepwater Horizon and its crew had compiled seven consecutive years of operations without a single lost-time safety incident, " the company said in a written statement.

CNN: Rig survivors: BP ordered shortcut on day of blast