Blocks of ice can last a shocking long time if stored correctly. In the 19th century, Fredric Tutor made his fortune shipping ice from frozen American ponds all the way to Cuba.
With the convenience of electricity, we don’t need to harvest ice from ponds anymore. But sometimes electricity stops working, such as during Hurricane Sandy.
These bucket-shaped ice blocks were made by the National Aquarium in Washington DC in preparation for Hurricane Sandy. If they had lost power these would be instrumental in regulating water temperatures for their aquariums.
If any readers know how long this ice would stay frozen, please share in the comments!