ProfessionalMackem
Striker
Gobal flood command and control centre/refuge - that's my guess. Unlikely to be anything to do with biohazard because even the Americans wouldn't so daft to put one under an airport.
I'd guess all commands are there including biohazard. Just look at the ventilation shafts, enormous, no need to be that size. And yes, they are that daft. Have you not seen Resident Evil? The Umbrella corporation has loads of these iceberg-esque subterranean lairs around the world, getting up to some nefarious shit.