Semi submarine
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Semi-submarines are submersibles that have the capability of diving just like submarines. However they are not able to dive very deep. In fact semi-submersibles immerse so that the vessels' deck is never fully flooded.
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[edit] Design
The most common design is that of a vessel body just like a ship. The passenger cabin is relatively low, about man's height below sea level. The cabin is equipped with large windows looking out starboard and larboard 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. Failure of a submarine during operation induces fatal injuries or mortalities. Therefore very effective rules have been established to ensure safety at any time. The certification process of a submarine is very strict and results in tight limitations to the design of submarines.
All this applies to a lesser extend 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. A great experience - only compared to scuba diving can be obtained. Customers can leave the submerged cabin to the unsubmerged deck at any time.
[edit] Use
Semi-Submarines can be used for research, but they are most commonly used in the tourism industry. Tour operators started replacing their glass bottom boat fleets with semi submarines due to their increasing popularity.
[edit] Legal Status
Semi-Submarines do not have an international classified status. Their operating range from the native port might be limited by the local authorities.
