1999

From Resident Evil Wiki

[edit] c. March

A jet flies over the crater of Raccoon City, and takes photographs of the landscape. The photographs are transmitted down into an observation tower located deep within the crater, which has now been totally quarantined and fenced off.

The scientists at the base talk about non-human life forms that have survived 6 months on, and talking to an unknown person on the phone, mention how they are going to begin a series of tests which suggests relatively small amounts of T have survived.