Horror labs decsending into the lower labs part 1.

This lab was build around 1950 after 27 years of scientists doing top seceret research a chemical spill ended it all. No one in the lab survived the lab was closed sometime 1977. The toxic chemical also caused the effects of the structure to deteriorate almost 3 times faster. So the structure is practically falling apart now after 43 years the chemicals effects are practically gone and it is safe to explore the labs. You have been hired to to this exact job to find what chemical caused this outbreak to spread so fast. And wipe out the lab in a matter of hours.