Hulks: true blue solution to age old problem.

ITEM:The Federal Government wants to hold illegal fisherman and asylum seekers intercepted in Australia waters for up to a month in a prison ship.
Customs is searching for a vessel that can be converted to hold up 30 detainees and be armed with mounted machine guns.

What's so novel about that?
Wikipedia:A hulk is a ship that is afloat, but incapable of going to sea.A prison hulk was a hulk used as a floating prison. They were especially popular in Great Britain; the Royal Navy producing a steady supply of ships too worn-out to use in combat, but still afloat. The harbor location of prison hulks was also convenient for the temporary holding of persons being transported to Australia and elsewhere overseas. These were decommisioned in the mid 1800s.