Overview
In the nuclear in last level is the secret yard as part of the map.
Nuclear winter – Last Level
In the nuclear in last level is the secret yard as part of the map. The only way how to get there is using cheat for clipping “dnclip”.
After that, right after begining of the level. In a small cave go next to right wall and go through. (look closer to scrrenshot, there is a map showinng right position)
You should teleport into small ventilation shaft.
In its end is a wall and behind this wall is another shaft, which has two posible ways to go.
Right and down where is nothing. just deep hole or left and up where is a secret yard.
There are screenshots from guide.
Enjoy it.