Prison ship ships at sea, claiming legal authority to do so. In 2009 the US Navy converted the main deck aboard the supply ship into a brig to hold pirates captured off the coast of Somalia until they could be transferred to Kenya for prosecution. The brig was capable of holding up to twenty-six prisoners and was operated by a detachment of Marines from the 26th Marine Expeditionary Unit. Charles Dickens' novel "Great Expectations" opens in 1812 with the escape of the convict Abel Magwitch from a hulk moored in the Thames Estuary. In fact, the prison ships were largely moored off
Charles Dickens school, and then at a school run by William Giles, a dissenter, in Chatham. This period came to an end in June 1822, when John Dickens was recalled to Navy Pay Office headquarters at Somerset House, and the family (except for Charles, who stayed behind to finish his final term of work) moved to Camden Town in London. The family had left Kent amidst rapidly mounting debts, and, living beyond his means, John Dickens was forced by his creditors into the Marshalsea debtors' prison in Southwark, London in 1824. His wife and youngest children joined him there, as was the