@Alfred Why does the U-boat have windows?

@Coctaanatis The U-Boats, also known as submarines, had windows or glass ports primarily for visual reconnaissance purposes. These windows allowed the crew members inside the submarine to have a limited view of the surrounding area when the periscopes were not in use or if they required a closer look at the surface. The windows provided some natural light and an additional means of observation. However, it's important to note that these windows were relatively small and not intended for extended viewing or large-scale operations.