Here are entered works on unmanned underwater robotic vehicles that are connected by cables to an operator. Works on unmanned underwater robotic vehicles that operate independently with no cables connecting it to an operator are entered under Autonomous underwater vehicles
Underwater surveillance -- Japan : The tools of Owatasumi : Japan's ocean surveillance and coastal defence capabilities / Desmond Ball and Richard Tanter
Here are entered works on free diving with the use of mask, fins, and snorkel. Works on free diving with the use of a self-contained underwater breathing apparatus are entered under Scuba diving
Underwater videography -- Data processing : Fish4Knowledge : collecting and analyzing massive coral reef fish video data / Robert B. Fisher, Yun-Hen Chen-Burger, Daniela Giordano, Lynda Hardman, Fang-Pang Lin, editors
Durer, Albrecht, 1471-1528. Underweysung der Messung : On the rationalization of sight : with an examination of three Renaissance texts on perspective / William M. Ivins, Jr. De artificiali perspectiva : reproducing both the first edition (Toul, 1505) and the second edition (Toul, 1509) / Viator