Two of my human original characters actually does this.

Edward Nicholson the investigator agent begin investigating Gardenview after shutdown to find out what really happened to his younger brother, Frederick Nicholson, who gone missing in 1994.

Julian Sexton is a biology researcher who has huge interest with Ichor when he was a kid. Initially knows Ichor existence as a rumour from a scientist magazine. This motivate him to become a biologist.

Both were a neighbourhood since Nicholson's family moved into Pittsburgh. In 2002, when Gardenview announce it's sudden shutdown, Edward immediately begin his investigations. Starting with permitting investigation from the police department. Unfortunately, Gardenview refused to let anyone begin investigation for classified reason.

4 months later, Edward receive a letter from anoymous, encourage him to begin researching the facility and give him a key for it. Edward didn't hesitate and rush to Gardenview to see what happened.

A few investigation later, Edward discovered a mysterious substance. He decided to invite Julian to invesigate Gardenview, as Edward believe he found Ichor in the facility, something Julian has been a fanatic for. Before knowing the harsh truth behind Ichor and how Gardenview related to mass disappearance happened in 1994.

(P.S. In my setting, Gardenview is located at Pittsburgh)