The Biber midget submarine was one of the smallest German submarines of World War II. Designed for coastal operations, it was meant to attack enemy ships with torpedoes — quietly, unexpectedly and without the need for large U-boat bases. Reality was far more dangerous: Cramped conditions, limited range and frequent technical problems made missions extremely risky. For the often inexperienced pilots, every deployment could become a one-way mission. Today, the Biber stands as a symbol of the late-

Most Dangerous Weapon in Human History A submarine (or sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.)[2] The term “submarine” is also sometimes used historically or informally to refer to remotely operated vehicles and robots, or to medium-sized or smaller vessels (such as the midget submarine and the wet sub). Submarines are referred to as boats rather than ships regardless of their size.[3] | Life

Meet Nemo, the $1 million personal submarine. | Mashable