The Iserbrook was a general cargo and passenger brig built in 1853 at Hamburg (Germany) for Joh. Ces. Godeffroy & Sohn. It spent over twenty years as an immigrant and general cargo vessel, transporting passengers from Hamburg to South Africa, Australia and Chile, as well as servicing its owner’s business in the Pacific. Later on, the vessel came into Australian possession and continued sailing for the Pacific trade. In 1878 it caught fire and was sunk the same year. At last, it was re-floated and used as a transport barge and hulk in Sydney until it sunk again and finally was blown up.