Here's another aerial view of the entire Fukushima-1 nuclear complex: click here for image!

There are also diagrams that clarify the position of the reactors, the tunnels, and trenches that have come up for discussion.

In my mind I've evidently had the relative positions of reactor units 1-4 reversed with regard to their proximity to the bay. And I was never quite sure where reactor units 5 and 6 were.

So the workers enter Unit-1 in teams for 10 minutes each. Does this mean they return for another 10-minute shift? If so, what is the logic of that in terms of limiting their exposure?

Charley Noble