In 2013, the unclassified monster Axe-Head, also known as Trespasser, landed in San Francisco. America's air force joined forces with the British Royal Air Force and hammered it for six straight days, to no effect.
In the end, three tactical nuclear bombs killed it. By then, it had flattened three cities and left a million people dead or injured.
In 2014, a second monster landed in Batangas Province in the Philippines and attacked Manila.
The US Military stationed in the Philippines also used tactical nuclear weapons to destroy it. But before that, it had demolished most of downtown Manila and killed tens of thousands. Its remains contaminated a vast area after its death. The monster was later named Chaos.
Then came a third monster. And a fourth.
Each had emerged without warning from the depths of the Pacific Ocean.
Only then did the leaders of the world's major powers convene a summit to discuss how to fight the monsters.
At the summit, scientist Gaspar Sheffield proposed a project to build giant mechs specifically to fight Kaiju: the Jaeger Program.
The Pan Pacific Defense Corps was subsequently established in Hong Kong.
It then developed a human-machine link called the Pons System.
Within months, the first Jaeger, Brawler Yukon, was ready. But its pilot died during testing when his neurons were overloaded.
Thanks to Dr. Catherine Lightcap's efforts, the Drift Neural Link System was developed, allowing two pilots' brains to synchronize.
From then on, Jaegers were piloted by two people, or even three, rather than one.
The Dome Base where Li Wei and the others stood was the world's first Jaeger base, and its largest.
But by now, the Jaeger Program had grown so expensive that some people wanted to abandon it.
They were preparing the Wall of Life Program to replace