When taking the elevator down into a pit, it stops for a moment and then keeps going. After continuing, the elevator falls and it looks like you will get stuck in the green radiation below. In some instances, you will clip through the floor and get stuck under the elevator.
hostname: Black Mesa
version : 100001/24 100001 insecure
map : bm_c1a4d at: 2393 x, 2143 y, 1217 z
setpos 2362.522949 2125.484619 1217.031250