Semi-submarine

Semi-submarines are submersibles vessels that are capable of diving, similarly to submarines. However, unlike submarines, they cannot be entirely submerged below the surface of the water.

This article is about semisubs. For other semi-sub types, see semi-submersible.
A semi-submarine

Design

The most common design is one similar to a ship. The passenger cabin is relatively low, a few meters below sea level. The cabin is equipped with large windows into the water. The passengers can observe the marine environment that is passed during the voyage.

There are significant differences between a submarine and a semi-submarine from an engineering point of view. Submarines are human-occupied pressure vessels, while pressure concerns apply to a lesser extent to semi-submarines. As the pressure close to the water surface is relatively low, the viewing windows can be bigger. In some advanced designs the windows enclose the majority of the submersed hull, creating an experience comparable to scuba diving. Customers can leave the submerged cabin for the unsubmerged deck at any time.

Use

Semi-submarines can be used for research, but they are most commonly used in the tourism industry. However, large tourism-oriented semi submarines should not be confused with narco-submarines which are smaller home-made semi-submarines used to smuggle drugs.

Semi-submarines do not have an international classified status. Their operating range from the native port might be limited by the local authorities.

gollark: Of course, they are uncool compared to full computers.
gollark: Mine can even autosolve arbitrary one-variable equations.
gollark: I mostly interact with good scientific ones these days.
gollark: Integer square root is not too horrible.
gollark: no.

See also
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.