The narrow service juntions press in like a coffin of steel around the hulking black armoured marines. Venting CO2, flickeirng lights and crackling ozone discharges leaving the marines less alert than they would normally be.

After maybe 200m you can see that your service tunnel - a 2m wide cramped tube terminates in a T-Junction. As the team reaches the corner it explodes in fire as a ail of hundreds of shells lacerate and tear the wal and pipes to pieces in a vast explosion of sparks and crackling discharges.

A glance round the corner reveals the narrow tunnels both left and right both occupied by a powerful looking servitor- some sort of massive multi-barrelled cannon clutched by the automated battle driods...



In the flickering lights and emergency strobes and the dull green glow of your enhanced photo-visors you can see both combat bots are some 40m up the tunnels.