Damocles Event

The Damocles Apocalypse was a cataclysmic event that occurred on April 26th 2156 when Paxton McCreary bombed the Shallow Valley using hythelodium tanks from Eligius IV ship. After the bombing Earth was completely destroyed and unhabitable.

History
Damocles was first mentioned by Captain Stevens in Captain's log from April 04 2047. Stevens says that somebody has to prevent Diyoza from weaponizing the cargo.

After Eligius IV came back to Earth Damocles became useless, because it could destroy the last survivable land on Earth. Still, Shallow Valley was not safe. Wonkru in their conflict with Eligius planned on using worms from the wasteland as a bioweapon, but Clarke and Madi unintentionally took them with the Rover from Polis and dumped them back to wasteland.

When it came to a final clash between two sides Eligius lost the valley to Wonkru, but McCreary decided to bomb Eden using Damocles. He wanted to leave the planet aboard Gagarin but Clarke, Shaw and Raven managed to take over the ship and fill it with 412 people and escaped to space.

Aftermath
Bomb's explosion caused a complete destruction of Shallow Valley. Shaw expected that it would take at least 10 years for the valley to be habitable again. 410 people were put into cryosleep to wake up 10 years after the apocalypse. Monty and Harper were the only people who didn't go into cryo. Monty monitored Earth for 10 years but it was still unhabitable so he didn't wake anyone up from sleep. It turned out that Earth was completely destroyed and it couldn't sustain life anymore. After that Green devoted his life to save the human race and find a place to live. Not long before his death, Monty cracked Eligius III file and sent Eligius IV to Two-Sun Planet. After 75 years it finally arrived at the destination, starting a new chapter of the human race.

Weapon
Damocles was a bomb made of hythelodium from asteroid Proxima VI. Hythelodium was kept in massive tanks that were attached to a rocket engine. Then it was proppeled by it into the ground an exploded on impact. It could destroy a massive area and make it toxic. Toxicity of hythelodium caused lung disease that a large amount of Eligius Prisoners suffered from.