Take a look into the world's first combat submarine: | NOVA l PBS

Have you ever wondered how a submarine moves so quietly and smoothly beneath the ocean’s surface? These incredible vessels utilize sleek shapes and specialized coatings to reduce noise, making them difficult to detect. They are powered by advanced batteries that can last for weeks underwater, while some also use innovative fuel systems that generate power quietly and efficiently. Inside, the crew works together to navigate the submarine silently through the deep. Follow @jkcementindia for more s