This map does not work with walker correctly,it causes gameobjects have wrong transform.

You can load the map in Sandbox Classic from Softsplit.

The map built with facepunch , sbox.game tilemeshs, some CC BY model assets
Built by using Scenic Hammer .

ALL CC BY 4.0 Assets:
T72M1 made by DustyMojito;
Bunker Light made by antoineallardchoquette;
Old metal bunker door made by rakutin;
Funke + Huster Bunker Telephone made by Oleksandr Tserkovniy;
Military Crate made by evgenymur;
Military box with ammunition PG-7V made by Ivan Norman;
A7B USSR Military Radio made by EricKos;
Weathered Fluorescent Light made by Mark Peters;
Light Ceiling Lamp made by Mehdi Shahsavan;
Caged Light made by Jacob Smith;
Industrial Work Light made by denis_cliofas;

Thanks to my friend aen helping me making a music.
Thanks to my friend Wingless helping me making L2A4 tank.