March 1854. The squadron put to sea once more to explore in the Bonins, the Ladrones, and the Marianas. Porpoise parted company with the other vessels on 21 September 1854 between Formosa and China, and was never heard from again. It is supposed that she foundered in a heavy typhoon which occurred a few days after her separation from the squadron. See also European and American voyages of scientific exploration References External links USS Porpoise Journal, 19 February 1845–16 June 1846 (#1163), East Carolina Manuscript Collection, J. Y. Joyner Library, East Carolina University Brigs of the United States Navy Mexican–American War ships of the United States Missing ships Shipwrecks in the Pacific Ocean 1836 ships Maritime incidents in September 1854 Ships of the United States Exploring Expedition Ships lost with all hands