The Umbrella Executive Training Center was the exclusive Umbrella Corporation executive officer training school that happens to be the secret laboratory complex beneath its adjacent mansion-like church exterior. It was a facility designed to train prospective executive officers and scientists to become the next generation of the company's management.
The training facility was established in the August of 1968 in the Arklay Mountains. Umbrella founder Oswell E. Spencer chose his close friend and co-founder Dr. James Marcus to be its director, a position which Marcus accepted after some early hesitation.
Not getting involved with his students' teachings, Marcus used his time to research the Progenitor Virus in his laboratory. Instead, he left education up to his assistant director.
In September of 1977, William Birkin and Albert Wesker, two young and keen employees seeking education in virology. Their rivalry got the attention of Marcus, who had his assistant encourage fierce competition between the two.
The facility was eventually closed the following year, leaving Marcus to work on his own while William and Albert were transferred to the nearby Arklay Laboratory.
Ten years later in 1988, Marcus was taken surprise by Umbrella Security Service commandos, who gunned him down in the middle of an experiment. Before being thrown into the sewage system, he would see the faces of two familiar people: William and Albert. William mockingly announced that he would be "taking over" his (Marcus') research.
In July of 1998, the Umbrella Corporation planned to re-open the facility, unaware of the recent T-Virus outbreak in the area. Albert and William were put in charge of this operation.
The First Investigation Unit that entered the facility reported minor problems that would need to be corrected when re-opened, such as misplaced chemical stations. They later reported more serious violations by Marcus in the form of forced viral experimentation on human guinea pigs. The Unit was later attacked by the revived Marcus, who was brought back by the Queen Leech.
Ultimately the facility was destroyed when William activated the self-destruct system in an attempt to prevent the outbreak from spreading further.
This facility served many purposes. There were living quarters for the people who stayed there, classrooms, libraries, laboratories, a torture room, training fields, art rooms, dining rooms, a kitchen, studies, a bar, a clock room, a cage room, bathrooms, a gas testing room, morgues, a trophy room, a breeding room for the leeches, sewer access, as well as an astrological tower with a telescope. There was even a church (which is really an Umbrella training facility) outside of the main building. A cable car ran underneath the building, connecting it to the Umbrella Chemical Plant.