CT's may not go down the ladder to T spawn
CT's may not go down the stairway overlooking the 2 story 'warehouse' area.
CT's may not go beyond the level ground half-way down the ramp.
All rules are off once the bomb has been planted.
(http://www.btinternet.com/~p.d.herbert/mhpcs/2dmaps/VERTIGO.JPG)