Alvin (DSV-2) is a crewed deep-ocean research submersible owned by the United States Navy and operated by the Woods Hole Oceanographic Institution (WHOI) in Woods Hole, Massachusetts. The vehicle was built by General Mills' Electronics Group in Minneapolis, Minnesota. Named to honor the prime mover and creative inspiration for the vehicle, Allyn Vine, Alvin was commissioned on 5 June 1964. The submersible is launched from the deep submergence support vessel RV Atlantis (AGOR-25), which is also owned by the U.S. Navy and operated by WHOI. The submersible has made more than 5,000 dives, carrying two scientists and a pilot, to observe the lifeforms that must cope with super-pressures and move about in total darkness, as well as exploring the wreck of Titanic. Research conducted by Alvin has been featured in nearly 2,000 scientific papers.
USS Dolphin (AGSS-555) was a United States Navy diesel-electric deep-diving research and development submarine. She was commissioned in 1968 and decommissioned in 2007. Her 38-year career was the longest in history for a US Navy submarine. She was the Navy's last operational conventionally powered submarine.
The Spruance-class destroyer was developed by the United States to replace the many World War II–built Allen M. Sumner- and Gearing-class destroyers, and was the primary destroyer built for the U.S. Navy during the 1970s and 1980s. It was named in honor of United States Navy Admiral Raymond A. Spruance, who successfully led major naval battles in the Asiatic-Pacific Theater during World War II such as the Battle of Midway and the Battle of the Philippine Sea.
A midget submarine is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to six or nine, with little or no on-board living accommodation. They normally work with mother ships, from which they are launched and recovered and which provide living accommodation for the crew and support staff.
A deep-submergence vehicle (DSV) is a deep-diving crewed submersible that is self-propelled. Several navies operate vehicles that can be accurately described as DSVs. DSVs are commonly divided into two types: research DSVs, which are used for exploration and surveying, and DSRVs, which are intended to be used for rescuing the crew of a sunken navy submarine, clandestine (espionage) missions, or both. DSRVs are equipped with docking chambers to allow personnel ingress and egress via a manhole.
The Talwar-class frigates or Project 11356 are a class of stealth guided missile frigates designed and built by Russia for the Indian Navy. The Talwar-class guided missile frigates are the improved versions of the Krivak III-class frigates used by the Russian Coast Guard. The design has been further developed as the Admiral Grigorovich-class frigate for the Russian Navy. Six ships were built in two batches between 1999 and 2013.
Trieste II(DSV-1) was the successor to Trieste—the United States Navy's first bathyscaphe purchased from its Swiss designers.
The Krivak class, Soviet designation Project 1135 Burevestnik, are a series of frigates and guard ships built in the Soviet Union primarily for the Soviet Navy since 1970. Later some sub-branches, like the Nerey (Nereus) were designed for coastal patrol by the KGB Border Troops. Until 1977, the ships in the class were considered to be large anti-submarine warfare vessels.
DSV-4 is a 25-ton, crewed deep-ocean research submersible owned by the United States Navy, now known only by its hull number, not by its former name.
The Neustrashimy class, Soviet designation Project 11540 Yastreb (hawk), is a series of large frigates built for the Soviet Navy and currently in service with the Russian Navy. Seven ships were planned for the Soviet Navy, but the fall of the Soviet Union disrupted those plans. Two ships were completed, both currently in active service with the Russian Baltic Fleet.
USNS Indomitable (T-AGOS-7) was a United States Navy Stalwart-class ocean surveillance ship in service from 1985 to 2002. From 2003 until 18 June 2014, she was in commission in the National Oceanic and Atmospheric Administration (NOAA) as the oceanographic research ship NOAAS McArthur II. As of 2018 it serves as a mother ship now named the Deep Submersible Support Vessel (DSSV) Pressure Drop for the crewed deep-ocean research submersible DSV Limiting Factor.
Aluminaut was the world's first aluminum submarine. An experimental vessel, the 80-ton, 15.5-metre (51 ft) crewed deep-ocean research submersible was built by Reynolds Metals Company, which was seeking to promote the utility of aluminum. Aluminaut was based in Miami, Florida, and was operated from 1964 to 1970 by Reynolds Submarine Services, doing contract work for the U.S. Navy and other organizations, including marine biologist Jacques Cousteau.
The Sea Pole class bathyscaphe is a class of bathyscaphe of the People's Republic of China (PRC). They are capable of diving up to 7,000 meters, covering 99.8% of the oceanic floor of the world. Two units of this class are planned, with derivatives to follow and are used by both the civilian and military establishments in China.
Osprey class submersible is a class of submersible of the People's Liberation Army Navy (PLAN) specially designed to perform torpedo retrieving missions at test ranges. This class submersible was highly classified when it originally entered service in 1989, and it was not until more than a decade later in the mid of the first decade of the 21st century when it was revealed to the public, when one of the design team members, the deputy general designer Mr. Sun Xin (孙欣), was publicized in a 2006 interview to disclose some characteristics of the submersible. This class is currently consisted of two boats, Osprey 1 and Osprey 2.
The Ivan Gren class, Russian designation Project 11711, is a class of landing ship that is being built for the Russian Navy. The class was to be composed of two vessels, Ivan Gren and Pyotr Morgunov, but later it was announced that the Russian Navy intends to acquire several more vessels of a modified design.
INS Teg (F45) is the fourth Talwar-class frigate constructed for the Indian Navy. She was built by the Yantar shipyard in Kaliningrad, Russia, and was commissioned to Navy service on 27 April 2012. She is the first of the second batch of Talwar-class frigates to be completed.
The Shinkai (しんかい) is a crewed research submersible that can dive up to a depth of 600 m. It was completed in 1970, and until 1981 it had the greatest depth range of any crewed research vehicle in Japan. The Shinkai is owned and run by the Japan Coast Guard and it is launched from the support vessel Otomemaru (乙女丸).
Yantar Shipyard is a Russian shipbuilding company based in Kaliningrad, Russia.
Yantar (Янтарь) is a special purpose intelligence collection ship built for the Russian Navy. The ship has been operated by the Russian Navy's Main Directorate of Underwater Research (GUGI) since 2015 and is reportedly a spy ship. The vessel's home port is Severomorsk, where it is attached to the Northern Fleet. It is the lead ship of its class, with two sister ships under construction.
DSV-5, ex-NEMO, was a submersible used by the United States Navy between 1970 and 1986 to oversee and observe undersea construction work. NEMO had a spherical transparent acrylic hull, which gave occupants panoramic vision. NEMO was the first submersible with a hull made entirely out of transparent acrylic (Plexiglass), and much of her career was spent testing this hull design. NEMO was found to be an effective observation platform, despite not being able to hover in place, and acrylic-hulled submersibles have continued to be built and operated in the United States. NEMO is considered part of the Alvin class of Deep Submergence Vehicles despite bearing little resemblance to the other subs of the class. NEMO was transferred to "other government agencies" in 1986 and retired from government service in 2011. It was then given to the U.S. Navy Seabee Museum, where it remains on display.
Russian Navy 
