Piracy protection firms profit from more work in Asia
More and more Asian tankers are picking up oil and other commodities from the Gulf of Guinea.
But the area, particularly off the coast of Nigeria is also developing into a piracy hotspot.
Phillip Cable is the chief executive of private security firm MAST, and he says that about 60% of his clients now come from Asia.
BBC's Sharanjit Leyl spoke to Phillip about his clients and the nature of his work.