What can be done to stop this happening so often. Ships that are single hull rust buckets such as this one was, legally transport oil around the world. When accidents like this disaster happen the same questions are asked but nothing changes. The law of the sea allows unseaworthy vessels to be registered in countries whose laws are slack enough to permit it. If these hulks were cars they wouldn't be allowed on the road in most countries. The regulations have to be tightened if this sort of environmental disaster is to stop.