You meant the barrier under San Andreas? Yup, that's not possible anymore (that's annoying for some maps like Area 51 interior).
By the way, you can always script this, here's an example:
function onClientRender ()
x, y, z = getElementPosition ( getLocalPlayer() )
if z < -10 then
setElementPosition ( getLocalPlayer(), x, y, 9 )
end
end
addEventHandler ( "onClientRender", root, onClientRender )
That's not the best way but it's an example.