Well, what else is one to do with a space bridge? :)

I'm still poking at the timeline in my head to see if they get back undetected. They arrived in Britain at 2am local time, figure roughly an hour to get to Stonehenge, sunrise was at 4:43am on 6/18/10... and Stonehenge is clearly visible from two commuter roads. The clock is ticking.

As to the disturbed earth, fairy rings. That's Sam's story, and he's sticking to it. :)