In 1841, Thomas Lempriere, an amateur meteorologist at the Port Arthur penal station, cut a notch in rock on the Isle of the Dead, the main burying ground for the isolated colony in Tasmania’s southeast. Re-surveyed more than 150 years later, this site continues to be monitored using tools of the 20th century, which can also detect vertical movement of land. The estimated rate of sea-level rise is about 1 mm/yr, near the lower end of the IPCC estimates.