In recent years, it has become clear that special purpose, unmanned submersible vehicles can augment or replace manned submersibles. There are two basic types of unmanned submersibles. The remotely operated vehicle (ROV) is controlled from the surface by a tether, or cable, which is used to transmit power to the vehicle and serve as the medium through which the video signal and other sensor data are transmitted to the surface. The untethered ROV, more generally called an autonomous underwater vehicle (AUV), eliminates the cable and carries its own power. Because of the drastically reduced bandwidth and transmission delays inherent in tetherless underwater communications, these vehicles roam freely using onboard computers to run preset missions. Transmission of instructions to, and video information from, the vehicle is accomplished by means of an acoustic communication link. Some manned submersibles are equipped to carry ROVs to allow exploration of areas too small or dangerous for direct observation by the submersibles themselves.
Submersibles are being used in an increasing number of applications. In addition to salvage and rescue missions, submersibles are used for laying pipelines underwater, for work on offshore oil drilling platforms, and for seafloor mapping, underwater surveys, and tunnel and aqueduct inspections.
Most modern submersibles are descendants of the first diving sphere (bathysphere), developed in the 1930s, and the more mobile submarine, which cannot operate at great depths. The inherent danger in a bathysphere was its inability to surface on its own accord, being raised and lowered by a winch system on a surface vessel. In 1954 one of the first types of submersible, the bathyscaphe, was designed and successfully tested by Auguste Piccard to overcome this problem and to provide limited maneuverability. A bathyscaphe is in effect an underwater balloon. The cabin is suspended beneath a large flotation chamber that contains gasoline and iron pellets. Submersion is accomplished by release of some gasoline, rendering the craft heavier than water. To rise, some of the iron-shot ballast is released. A second model of the bathyscaphe, called the Trieste II, carried two men to a record-breaking depth of 35,800 ft (10,900 m) at the bottom of the Marianas trench in 1960.
One of the most impressive submersibles is the Aluminaut, constructed of high-strength aluminum alloys and able to operate at 15,000 ft (4,570 m) carrying a crew of six. The Alvin, operated by Woods Hole Oceanographic Institution, is capable of diving to depths of 13,000 ft (3,960 m) with a crew of three and, like the Aluminaut, is equipped with mechanical arms. In 1974 the Alvin and two French submersibles, the Archimède and Cyana, were used in a joint French-American venture, project FAMOUS (for French-American Mid-Ocean Undersea Study), to learn more about seafloor spreading. The Alvin was also used to photograph and retrieve objects from the Titanic after its discovery in 1987. In 1998 the French manned submersible Nautile, two manned Russian Mir submersibles, and assorted AUVs were used to raise a 22-ton section of the Titanic's hull.
A submersible , or bathyscaphe, is a type of underwater vessel with limited mobility which is typically transported to its area of operation by a surface vessel or large submarine. Used by oceanographers and marine scientists. Apart from size, the technical difference between a 'submersible' and a 'submarine' is that submersibles are not totally autonomous. They may rely on a support facility or vessel for charging of batteries, high pressure air, high pressure oxygen replenishment, or all of these. The main problem with submersibles is that they may be relatively small, holding only a small crew.
A submersible vessel has greater mobility, using propeller screws or pump-jets, than submersible chambers (diving chambers or diving bells), which are suspended from a cable and winch operated from the diving support vessel.
Submersibles differ from submarines in that submersibles typically have shorter range, and operate underwater almost exclusively, having little function at the surface. Many submersibles operate on a "tether" or "umbilical", remaining connected to a tender (a submarine, surface vessel or platform). It can dive over 6 miles (10 km).
Small unmanned submersibles called "marine remotely operated vehicles" or MROVs are widely used today to work in water too deep or too dangerous for divers.
Remotely operated vehicles (ROVs) repair offshore petroleum platforms and attach cables to sunken ships to hoist them. Such remotely operated vehicles are attached by a tether (a thick cable providing power and communications) to control center on a ship. Operators on the ship see video images sent back from the robot and may control its propellers and manipulator arm. The wreck of the Titanic was explored by such a vehicle, as well as by a manned vessel.
Among the most famous submersibles is the deep-submergence research vessel DSV Alvin.