The Lysine Contingency is the only thing that can WIPE OUT everyone and everything at StarGate. It is a small box with a big red button on it.
The lysine contingency is intended to prevent the spread of Secrets (carried by all StarGate employees) in case they ever get out to the public. Dr. Nightblade inserted a gene that makes a single faulty enzyme in protein metabolism. The people can't manufacture the amino acid lysine. Unless they're continually supplied with lysine by Ender or another leading member, they'll slip into a coma and die.