A vessel loaded slops from a North Sea installation, believing it to be “grey-black muddy water”, as it was so described on the analysis report, being free from H2S and explosive gas. However, upon arrival for discharge ashore, it was discovered that the slops were contaminated and had a ‘moderate’ H2S content of 25ppm. Further, it subsequently emerged that this was the
fourth such instance in ten days. The health risks to the crew and contractors are obvious.