Also:"There is ALLWAYS a sewer large enough to go through near by!"
We got to use the sewers properly just the once. After that we found:
- The sewers/stormwater access drains required full-suit scuba gear due to recent heavy rains
- Repeated use of monowire grating (that hurt.... and open wounds in a sewer...ewwwww

)
- Paracritters a go go
- A toxic spirit or two (Excrementals.... yep, they're icky

)
And basically that't not working.
And just once the crew decided to screw it all and go for a full-frontal assault (My PC thought it was crazy so declined to take part, but decided to watch in the Astral from a great distance). Events which then followed were:
- Heavy weapons fire reduces front gate to rubble
- Rigger maneuvers van through wreckage and into open compound
- Sirens and loudspeakers start wailing: '
Unauthorised access Code 1. Surrender immediately. Resistance will be met with deadly force'
- Group continues, their heavy weapons popping off at any targets of opportunity (Gatehouses, radio antennae, guards etc)
- Turretted ARES Firelance lasers pop-out from multiple gate sections and walls
- Group gets turned into sushi