Reprieve, a human rights organization (UK branch, US branch), claims that the United States is using prison ships to keep prisoners outside legal jurisdictions. They say that there have been more than 200 new cases of rendition since 2006, when President George Bush declared that the practice had stopped.
A US Navy spokesman denied that such things were happening. Members of the British Parliament are calling for an investigation.
I hope Reprieve turns out to be wrong about this: