During WWI, many of the British, French, and German soldiers lived, fought, and died in trenches that snaked thousands of miles through the countryside. These trenches were grim, dark places averaging 7 feet deep and 6 feet wide. On the Allied side, they were often full of mud, rats, and disease. The men lived in these trenches, struggling to keep dry, stay alive, and not lose their minds. The trenches of the enemy were sometimes just 30 meters away, and sticking your head above the trench could easily get you killed.