On the second floor of the hangar is a small room. From the outside, you can reach it by climbing up the rubble pile on the side of the building.
Go to the porch outside the hanger entrance. Close to the hanger is a large white carved stone. Jump on it and try and hop over the fence. You will fail, but will land on the fence.
Go to Free Spectating mode and look around the map until you find a radio tower with Japanese flags on it near the Japanese spawn side. Go above the tower and slightly beside it. Wait a while and you should here a German or Russian commander voice.
At the bottom of the two story tin building on the Marine's spawn side is a jail cell with a dead tortured Russian soldier in it. Coming from the door in the cell, you can occasionally hear a Japanese person torturing another soldier.