San Francisco will soon be home to the Salesforce Tower, making it the tallest building in the city. To start, the project needed some concrete. 

In November, the project began with a massive concrete pour. It took 18 hours to pour concrete down a currently empty hole to create a 14 feet thick concrete slab. It will soon support 1,070 feet of glass, steel, and yes, more concrete for the Salesforce Tower. The 18 hour pour is one of the longest concrete pours in history, pouring over 12,00 cubic yards of concrete to fill the hole. The concrete began as 7,900,00 pounds of cement, 9,000 cubic yards of sand and gravel,and then 54,000 gallons of water at several mixing plants across the California Bay area.

This was all done in an effort to make sure the skyscraper would remain upright and not topple over. 

To learn more about this impressive concrete pour, click here

You can view a video of the concrete pour below.