Extinction Cycle: Extinction Bridge (Kindle Worlds Novella) (Extinction Australia Book 1)

Sydney, Australia. Post-contamination.
The island continent has been ravaged by the haemorrhage virus. Cities burn, society is destroyed and variants run rampant throughout the country. One group of Special Air Services troopers has managed to hold out against all odds.
Word comes of a possible weapon against the monsters held in a bunker deep beneath Australia’s largest capital city. The soldiers set out to retrieve it, but are the best of the best good enough? And are they prepared for the horror they’ll face on the extinction bridge?