Smoke Out | Border Wars

Why are the walls of the tunnel reinforced with materials like 2x4s and plywood?

• To make the tunnel look nicer.

• To provide insulation against temperature changes.

• To hold back the weight of the surrounding dirt and prevent collapse.

• To make it harder for people to escape.

What was the primary goal of using smoke in the tunnel?

• To clean the air inside the tunnel.

• To signal to people inside the tunnel.

• To determine if the tunnel had an exit on the other side of the border.

• To make the tunnel visible for aerial photography.

What is a significant danger of using a smoke grenade in a small, enclosed space like a tunnel?

• The smoke can cause explosions.

• The smoke displaces oxygen, making it difficult to breathe.

• The smoke attracts dangerous animals.

• The smoke can damage the tunnel walls.

What did it mean when the smoke from the grenade immediately came back out of the tunnel?

• The tunnel was too short.

• The smoke grenade was faulty.

• The tunnel was blocked or had collapsed.

• The air pressure inside the tunnel was too high.