It looks like a military or paramilitary facility - if we want to pass as people who belong, even at a glance, we'll need to secure uniforms and ID. If you can get close enough to get a clear look at what they're using and share that, perhaps one of the Travelers who's particularly adept at manipulating Liminal Space will be able to copy them...

I have some friends who could deal with any cameras, if we can get them inside. Anywhere inside. The ventilation system will do.