The Mining Guild breaks through the lines and lands a small force on Zhaum. The key to their assault plan is a mole – a machine designed for digging tunnels.
With the entry to the mining guild’s tunnel heavily guarded, the characters decide to try attacking the mole with bunker-buster torpedoes. This means they have to determine exactly where the mole is located beneath Zhaum’s surface. They only have two shots.
When that fails, the only other options are to attack the tunnel entrance, or to make a stand inside the pressure dome.
They decide to fight in the dome for two reasons – they can fight along side the colonists and they can try to evacuate the dome to their ship at the same time.