There is a 'Mech trap on the lower level of the central area of the map on the intersection of sectors D5/D6/E5/E6, grid reference 4017.1 - 4290.8 - 275.3 (see the marked spot, please).
The spot seems quite innocuous from the player's point of view. A cave that could serve as a good ambush point.
'Mech just about to enter the 'Mech trap.
It is impossible to leave the cave once you are in.
The doorstep is too tall from the inside.
Suggestion: Either fill in the cave or remove the doorstep.