Map limits for Ts:
At the lower exit from the hossie area, Ts cannot go down the small steps.
If in the vents, Ts cannot leave the vents at the upper dam exit.
On the top level of the hossie area, Ts should not advance further than the doorway at the end of the area by the three large floor to ceiling windows.
TL. 8)
(http://www.btinternet.com/~p.d.herbert/mhpcs/2dmaps/thunder.jpg)