A catastrophic train derailment sends the city spiraling into chaos. But the derailment is just the beginning. A biological gas attack sees crash survivors collapsing and dying within minutes. And the sickness is rapidly spreading. A catastrophic train derailment sends the city spiraling into chaos. But the derailment is just the beginning. A biological gas attack sees crash survivors collapsing and dying within minutes. And the sickness is rapidly spreading. A catastrophic train derailment sends the city spiraling into chaos. But the derailment is just the beginning. A biological gas attack sees crash survivors collapsing and dying within minutes. And the sickness is rapidly spreading. A catastrophic train derailment sends the city spiraling into chaos. But the derailment is just the beginning. A biological gas attack sees crash survivors collapsing and dying within minutes. And the sickness is rapidly spreading.