The most obvious choke points are the two breaches in the outer wall. Anyone entering the compound would have to pass through those entrances (or scale the wall). The second best spot is likely the security zone beneath the dish, which consists of a wall with one entrance, and a partially cleared minefield inside of it. If the security zone is surrounded though, you will have no way to escape (except perhaps by air).
The engineers can work two to a cable, and estimate it will take about 90 minutes to do complete all five (30 minutes per cable). The attempt to assist them doesn’t seem to have sped the effort at all.