Spoilers ahead
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Sierram is a town located on Junction E1 in the Outer Zone that was destroyed in 1973.
It is a required location in two missions: The Remnant Experiment and Stabilizing A Way Through.
Sierram's last-serving mayor was Steve Strawberry, in 1973.
History
Sierram is a town built to house ARDA personnel and their families. Circa 1973, the town was home to around 83 families.
The Sierram Disaster
On February 13, 1973, the first ever LIM fair was hosted in Sierram's town square. ARDA advertised the fair as "a good old fashioned small town get-together". The fair advertised the multiple uses of LIM technology, especially in mundane household equipment, such as washing machines or lawn mowers.
Around dinner time, a catastrophic energy burst at the fair destroyed the town center, killing everyone that was currently in Sierram. This event birthed a massive anomaly, which would be later-known as Colossal Cappy.
A wilderness youth camp 20 miles away from the epicenter were evacuated by ARDA hours later and shuttled to an orphanage, possibly being the only surviving (ex-)residents of Sierram.
Geography
Sierram's town center is located in a valley in the mid-eastern Outer Zone. A dilapidated highway bridge passes through the center of the town.
The town is full of Observatory Towers, erected following the Sierram Disaster to monitor Colossal Cappy. Sector Stabilizers can be seen in the distance surrounding the town.