Numbers help explain why the event still defines Heimaey, but the museum keeps those numbers tied to people.
The eruption began early on 23 January 1973 and lasted for five months. Heimaey's population was about 5,300; almost everyone evacuated, while roughly 200 rescue workers stayed. Lava and ash destroyed nearly 400 homes and businesses, about a third of the island's buildings.
The eruption also created the 220-meter Eldfell cone and added about two square kilometers to Heimaey. Eldheimar then widens the volcanic story with an exhibition about Surtsey, formed south of Heimaey during the 1963–67 submarine eruption and protected as a living record of how new land is colonized.