What are some different types of submarines?
A submarine is a diving vehicle with a better range than a submersible, and is defined as being relatively autonomous and independent. Crude submarines have been constructed for centuries, but submarine design didn’t really take off until the 19th century. Some of the earliest modern submarines were used for war, still by far their primary mode of usage, but in the last 60 years many research submarines have been constructed for scientific and archaeological purposes, broadening the role of these fascinating machines. A submarine has even been used to descend into the Mariana Trench, the deepest point in the ocean, which is about seven miles below the surface.
