This 835 ton ship was built at Shields in 1845. It was employed as a convict transport for Western Australia and left London, England on January 1, 1854 bound for the Swan River Colony. She carried the twelfth of 37 shipments of male convicts destined for Western Australia. The voyage took 94 days and the Sea Park arrived in Fremantle on April 5, 1854 with 180 passengers and 304 convicts [Erickson]. Thomas Spedding and Josiah Caldwell were the captain and surgeon respectively.

There was one death recorded on the convict shipping and description lists for Theodore Johnson (2923) but other sources indicate he died from pneumonia just after arrival. There were 304 convict numbers assigned for the voyage ranging from (2626 to 2929).

Of the 180 passengers mentioned above, 96 were pensioner guards and their families, the number being made up of 30 pensioner guards, 23 wives, 21 sons and 22 daughters. The remaining 84 passengers have not been accounted for but were possibly cabin passengers or regular soldiers.

Josiah Caldwell's surgeon's journal for the voyage is preserved in the Public Record Office (PRO) in London. Researchers can view a copy on the Australian Joint Copying Project (AJCP) microfilm reel 711 which is held in most major libraries and archives offices throughout Australia.