Their holds are filled with stolen oil running from valves illegally installed into a pipeline.
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It leaves in its wake chaos and misery for the people of the Niger Delta.
He says that attempts in the past to bring the trade under control were stopped for that reason.
But the militiamen say they were abandoned, so they turned to oil theft to fund their activities.
Although they are referred to in the media as "militants" there are few coherent groups.
Most are gangs, led by commanders who are perpetually at war with each other.
These militants don't see the process of oil theft as stealing, observers say.
They believe they are taking what is legitimately theirs from the companies and the government.
But militant-assisted theft is not the only way oil is stolen.
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Simply put, they just load more onto a ship than they are allowed to.
Or a whole ship can be filled with stolen crude using fake documents.
Part of the problem is that no one can be sure how much oil is being taken out of the ground.
Shipping documents can be forged.
The only way to shut down the oil cartels, observers say, is a tighter regulatory framework.
But activists in the Delta say that increasing the military presence would be counterproductive.
It would increase resentment and militants' numbers - the level of violence would rise, they say.
And the Nigerian military is part of that violence, observers say.
Soldiers have indiscriminately burned whole towns and killed civilians, according to activists.
It is into this chaotic shadow world that the UK is about to commit itself.