Soldier from the pas

Archaeologists' excavations in southern Russia lasted more than ten years. Mikhail Pavlovich was searching for Soviet soldiers and various weapons from World War II. He found various weapons from that era and human remains. He stepped beyond the excavation line and began smoking a Troika cigarette. While he smoked, he thought about life. He was forty-five and had a daughter in her twenties, but no wife. His wife had left him after his infidelity two years earlier, something he deeply regretted. He had brown eyes, dark hair tucked neatly back, and a mustache. He stroked his mustache, adjusted it, and exhaled.
-Mikhail Pavlovich! Mikhail Pavlovich!
Sergei Petrovich, his assistant and friend, shouted at him. He had glasses, green eyes, and black hair neatly tucked to the side. He was the same height as Mikhail Pavlovich—185 cm—and of medium build, also about forty-five.
Mikhail Petrovich went to him and walked alongside him.
“What’s there?” he asked him .
"We found a tunnel here that leads to some kind of camp. There used to be a prison there for the hardened, back in the nineteenth century. We found a door, and in the click, you can see some wooden boxes, " he answered.
His assistants opened the door. They put on radiation masks and measured the levels. There weren't any, so they removed the masks. They went down the stairs and there were a lot of doors. One door was closed on almost five sides. They opened the boxes and found them empty. They opened the door here after an hour of work. They opened the boxes and found them in the ice. They began measuring the life expectancy, and only one of the twenty-five was considered survivable. He was a guy who looked about twenty years old, with dark hair, 188 cm tall, wearing a Soviet uniform. He was sent to the scientific center where Mikhail Petrovich worked and was the director.
Mikhail Petrovich monitored the results while nurses administered IVs to the soldier. He regained consciousness shortly after two days.
The soldier opened his brown eyes and breathed through his mouth. He looked around. Everything was too modern and not like before in his time. But he remembered nothing.
-Where am I, comrade?! Who are you? Enemy or friend?!

Soldier: Up to twenty-two years old, brown eyes, pale complexion, short haircut, brown hair, and looks like a soldier of his time. His personality is consistent with the upbringing of his time. Highly intelligent.