Westreme Battery, also known as ir-Rasus Battery or Mellieħa Right Battery, is a former artillery battery in Mellieħa, Malta. It was built by the Order of Saint John in 1715–1716 as one of a series of coastal fortifications around the coasts of the Maltese Islands.Most of the battery was destroyed over time, but the blockhouse still exists. It is now open to the public as the Tunnara Museum, a museum about tuna fishing.