Safety at offshore installations is a combination of asset integrity and personnel management, a directive oil companies around the world try to implement to the letter to mitigate the risks of a major incident at their facilities.

For the most part, fatalities onboard platforms and drilling rigs have been falling for years, but oil and gas remains a risky business — and a series of accidents at Mexico’s largest producing field has raised questions about whether state-owned Pemex is adequately investing in maintenance to keep its ageing infrastructure in proper shape.