S.I.C.O.N has discovered that there is a vast network of Bug tunnels and colonies beneath the city of San Francisco. S.I.C.O.N. decides the only way to ensure victory is to hit the whole city with nukes the city thus destroying everything above and below ground. Because an evacuation of that size would warn the Bugs it has been decided not to warn the civilian inhabitants. Lt Razak objects to this action and, surprisingly, is supported by his nemesis from INTEL, Lt Walker. The Sky Marshal gives them 24 hours to complete the only alternate plan.They need to blow massive holes in the tunnels that run underwater and thus flush out the bugs to street level where troopers would be waiting for them.As a safeguard the bombs will be mixed with the last reserves of Toxin B3. If they fail though San Francisco will be destroyed by S.I.C.O.N. as will the two squads. Overall the mission is a success despite a bomb going non-op and needing to be reset. But Lt Razak is killed by