Been playing a bit of the survival mode in special ops. Don't recall the map name at the time, it'd the one in London with a lot of outdoor space via streets, etc. Do you guys have any strategies for survival? I can get decently far but at some point I get a ton of bombers on me at once and it becomes overwhelming for being outdoors or just inside a building. Roommate said you can go upstairs somewhere, haven't checked that out, but what are you alls general recommendations?