Alien Tunnels are a type of Terrain in the game Broforce. During the campaign it can be found in certain areas while aliens are invading the world. They looked like a static snake with a motive tongue and a mouth-like end. If a doodad reaches one end, they will be transported to the other end automatically. If it's shot at, it will dismantle and vanish.

Trivia

  • Interestingly, it is able to eat and transport grenades, as well as many other thrown projectiles to the other side of the tunnel.
    • Their fuses will be frozen until they exit the tunnel.
  • It's referred to "Assmouth" in-game.
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