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Not much is known about this Umbrella Biohazard contamination level.
Another one happened at the Umbrella Caucasus facility where over 90% of the research staff were "eliminated" (either infected from virus or killed at some point). In the Primary Contamination Zone, the survival rate was under 2%.
A "BL-4" contamination alarm went off in the Tricell facility underneath the ruins of the ancient Ndipaya Kingdom, BL-4 likely meant "Biohazard Level 4."