The ADA was first revealed, at the time known as The Organization. The Organization dug up the vault and built panels in the 4 corners of the island to pull out the Zero Point.

In Season 9, The Organization built bunkers around the island for the citizens to escape the corruption and provide a safe place to hide from the Corruption Queen upon her arrival.

The Organization launches a plan to collect people from the bunker and save Zero from the Corruption Queen's prison in The End Event.

The ADA (not revealed yet) have a base in a mountain in the south of Axiom Island. Here, they tested a mysterious crystal growing out of an island nearby.

In Season 2, the "ADA" acronym was revealed in the discord lore. The ADA also prepared for Theta's big plan to build an "Extractor" to extract the Axiom from out of the ground and bring it to her lasership in space to destroy the Nexus Rift.

The ADA built outposts in preparation for the fight against Theta and her AI robot army. As well, the "Axiom Defence Agency" full name was revealed in the newspaper articles. In the event, the ADA infiltrated the Extractor and dropped the Axiom then exploded the ship, saving the galaxy from the Nexus Rift being destroyed.

After the Extractor crashed down, it decimated large areas of the map, including the ADA's main base of Military Mountain. The ADA built a makeshift command center until they could build a more permanent one. Since the ADA were the ones to take down the extractor,  Aurora, who worked at the ADA blamed the destruction of her home on the ADA and created The Scavengers, a group to get revenge on the ADA. 

The Scavengers have successfully caused a dam breach at Daring Dam, releasing the corals inside. This prompted the ADA to finally build a permanent headquarters. They decided to build it around the Axiom to monitor it at all times and protect it.

The ADA's main base was swallowed by The Fissure, prompting them to build a new base. This new base, called Prime Post contained an energy cannon, the ADA's solution to The Axiom releasing its energy.

After being hired as the ADA's newest recruit, F-612b took over the ADA, tearing it down from the inside. During the fight to stop the energy cannon, the leader of the ADA, Echo was killed by F-612b. Zero killed F-612b shortly after. Theta's rocket then crashed into Prime Post, destroying what was left of the ADA. Now, only ADA guards remain, battling for a final chance to save our island from Theta.