FANDOM

Welcome to Half-Life Answers. What would you like to know?

Judging by how soon zombies are encountered after the resonance cascade (and the headcrab shelling of one of the underground railroad stations) it can't be more than a few minutes.

Ad blocker interference detected!


Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.