In the year 2256, humanity had colonized several planets across the galaxy, and interstellar travel had become routine. The United Earth Government had established a program to facilitate the transportation of people and goods between galaxies. The program, known as the Galactic Gateway Initiative, had developed a network of stable wormholes, or "gateways," that connected different galaxies.

In the aftermath of the disaster, a team of investigators was dispatched to analyze the cause of the implosion. Their report would later state: "The gateway imploded because there was not enough space to spawn the next wave, verified. This was a preventable error, and recommendations have been made to ensure that such an incident never occurs again."

The gateway's structure began to destabilize, and a massive explosion rocked the surrounding space. Debris was scattered across millions of kilometers, and the shockwave was felt throughout the galaxy.

The incident was a major setback for the Galactic Gateway Initiative, but it provided valuable lessons for the engineers and scientists working on the project. They vowed to never again underestimate the importance of adequate spacing in the operation of the gateways.

On this particular day, Gateway-3421 was operating at maximum capacity, ferrying hundreds of ships and thousands of passengers between the two galaxies. The gateway's AI, an intelligent system named "Echo," was responsible for managing the flow of traffic and ensuring the stability of the wormhole.