The One With Gus, The Lonely Fungus v The Lonely People Of The Fringe Division

Broyles: I want you and Agent Lee to assemble a small team and have them meet you in the tunnel.
Olivia: Based on the boys’ remains, the fungus colony at the tunnel is probably much bigger than what we have here. I’m not convinced that UV is the most efficient way to destroy it.
Broyles: You have something else in mind?
Olivia: I’m thinking flamethrowers.