Second Dawn Bunker

This Bunker, also known as "Becca's Crypt" or the "Level 12 Bunker" was created by a doomsday cult, known as the Second Dawn over 100 years ago.

According to Gaia, Becca is buried in the bunker.

History
The bunker was built sometime before the Nuclear Apocalypse, by Second Dawn founder, Bill Cadogan.

Throughout the Series
In God Complex, Thelonious Jaha, Marcus Kane, Monty Green, Indra and Gaia discover the bunker.

In Die All, Die Merrily, Clarke Griffin and Jaha go against the rules of the conclave, move most of Skaikru and Niylah into the bunker, except Kane, Octavia, Raven, and the ones who stayed at Arkadia.

In The Other Side, it becomes over-populated with approximately 1,564 people.

In The Chosen, Kane and Jaha gas their area of the bunker and sacrifice 364 Sky People in order for there to be enough oxygen and food for everyone else in the bunker.

In Praimfaya, Indra elects Octavia to lead the bunker for the people within.

Notes and Trivia

 * Big enough to fit about 1,200 people.
 * On a wall, there is a stone sign and flag that reads "From the ashes, we will rise."
 * The Bunker includes supplies like hazmat suits and it has airlocks.
 * According to Jaha, Hardy, and Clarke, there is an underground aquifer with a filtration system, hydroponic farms, oxygen and air scrubbers, and water recyclers, inside the bunker.