An aging fleet of tankers sail around the world, shifting oil and other goods in defiance of international sanctions.
In doing so they help keep revenues flowing for Russia, Iran and Venezuela, using deceptive tactics like manipulating tracking software, frequent name changes, false flags and opaque ownership structures to help evade detection.
Known as the dark or shadow fleet, they need insurance cover to be able to enter ports.
And that is where companies like Maritime Mutual have come in.