47m

47m is a designation that can refer to several different things, most notably a submarine and a depth measurement. The term "47m" is most commonly associated with the German Type 206 submarine, also known as the Type 206 U-boat. These submarines were a class of diesel-electric submarines built for the German Navy. They were designed for coastal defense and had a length of approximately 47 meters. Several submarines within this class bore designations that included "47m," though the specific number was part of a larger hull number.

Alternatively, "47m" can simply represent a depth of 47 meters. This is a unit of measurement in the metric system, indicating a vertical distance of 47,000 millimeters or approximately 154 feet. In contexts like diving, oceanography, or construction, 47 meters specifies a particular depth below the surface of water. Without further context, it is difficult to determine which specific meaning of "47m" is intended. However, the submarine class is a well-defined entity, while the depth measurement is a general unit.