That's an another example of what a metal detector, a shovel and a few hours of hard work can bring you while wandering through the Russian forests. You can start digging virtually anywhere with a chance of a find, as if you stop on your trip through European Russia and take a few steps into the wilderness you for sure can find the surrounding landscape being strangely uneven. It looks like the solid ground is wavy, with depressions here and there. What those are is the old time army
trenches left from the World War 2 era, and they can be encountered in the woods, on the outskirts of the villages, etc. I recall seeing those things around very often, and many remain untouched with no visible traces of modern excavation present, so probably a good shovel can help you get something like the things depicted here too. More guns, coins, nazi memorabilia and even hand grenades and machine gun ammo loads can be seen inside this post.