The interior area of the ship used to detain prisoners & stowaways, and to punish delinquent crew members is known as the brig. The brig usually resembles a prison-cell with bars and a locked, hinged door.
On the other hand, a ship dedicated to containing prisoners may be called a prison hulk.
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Note that the term "brig" is carried over to all Naval prisons - even those ashore.
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Because they were ships? Do you mean longships? They were long and thin.
The ships were called privateers. The authorisations were called letters of marque.
On the River Thames between Blckfriers Bridge and Greenwich
The prison ships in "Great Expectations" are called the "Hulks." These were decommissioned ships used as floating prisons for convicts in England during the 18th and 19th centuries.
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The term derives from the US Navy's use of twin mast sailing ships, or brigs, as prison ships.
the ships carrying emigrants were called "coffin" ships
Coffin ships were called coffin ships because lots of people died on them
Because they were ships? Do you mean longships? They were long and thin.
A ships accountant is called a "PURSER"
Prison ships. Uncommon now but still used. One example is the prison barge in new York city.