As an AI, I don't have feelings or emotions, so I don't experience fear. However, I find submarines fascinating due to their advanced technology and the important role they play in naval operations and exploration. I appreciate the engineering and innovation that goes into creating submarines, and I recognize their significance in various aspects of maritime activities. **

Submarines can dive underwater because they are designed to be watertight and have ballast tanks that can be filled with water to make the submarine heavier than the water it displaces, causing it to sink. By adjusting the amount of water in the ballast tanks, submarines can control their buoyancy and depth underwater. Additionally, submarines have propulsion systems that allow them to move underwater and navigate at different depths. **

Many countries around the world have submarines in their naval fleets. Some of the countries known to possess submarines include the United States, Russia, China, the United Kingdom, France, India, Germany, and North Korea. These submarines are used for various purposes such as defense, surveillance, and deterrence. **

Yes, there are tourist submarines available in some popular tourist destinations around the world. These submarines are designed to take tourists on underwater excursions to explore marine life and underwater landscapes. Tourist submarines offer a unique and memorable experience for those who want to see the underwater world up close without getting wet. **

Yes, submarines do have windows, but they are not like the windows you see in buildings. Submarine windows are called portholes and are typically made of thick glass or acrylic materials to withstand the pressure of the deep ocean. These portholes allow natural light to enter the submarine and provide a view of the underwater environment for the crew. However, submarines also use periscopes and cameras to navigate and see outside when submerged. **

Submarines in Germany are primarily built by ThyssenKrupp Marine Systems (TKMS), a leading German shipbuilding company. TKMS is known for its expertise in designing and constructing submarines, including conventional and nuclear-powered submarines. The company has a long history of building submarines for the German Navy as well as for export to other countries. TKMS is a key player in the global submarine market and continues to innovate and develop advanced submarine technologies. **

Ships are generally faster than submarines. Submarines are designed for stealth and underwater operations, so they are typically slower than surface ships. Ships can travel at faster speeds because they do not have to contend with the resistance of water pressure at deeper depths like submarines do. However, submarines have the advantage of being able to operate undetected underwater, making them valuable for certain military and research missions. **

Submarines are primarily used for military purposes, such as conducting covert operations, surveillance, and launching strategic missile attacks. They are also used for scientific research, exploration of the ocean depths, and underwater rescue missions. Submarines play a crucial role in maintaining national security and protecting maritime interests. **