The company posted a loss of €87.3 million ($98.2 million) for the first six months of the year, compared a loss of just €3.7 million in the first half of 2015.
The increased losses came as revenue fell from €758.8 million in the first half of last year to €599.2 million over the recent six month period.
Bourbon noted the prolonged downturn in the offshore industry as a result of low oil prices was continuing to put downward pressure on day rates and utilisation rates.
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