Purple Haze: Tunnel Rats

Lead a team of Marines on a new and dangerous type of mission. Descend into the dark and claustrophobic tunnels, fight the unseen enemy lurking in the shadows, avoid the horrifying booby traps, and emerge unscathed – if you can!
Tunnel Rats is a standalone expansion to Purple Haze featuring three scenarios and brand-new mechanics and introducing tense melee combat. It offers a vastly different experience to the Purple Haze core game, and a variety of new events and weapons.

—description from the publisher