Please answer the following question: Information: - Panama, officially called the Republic of Panama, is a country usually considered to be entirely in North America or Central America. It is bordered by Costa Rica to the west, Colombia (in South America) to the southeast, the Caribbean Sea to the north and the Pacific Ocean to the south. The capital and largest city is Panama City, whose metropolitan area is home to nearly half of the country's 3.9 million people. - Central America is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. Central America is bordered by Mexico to the north, Colombia to the southeast, the Caribbean Sea to the east, and the Pacific Ocean to the west. Central America consists of seven countries: Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama. The combined population of Central America is between 41,739,000 (2009 estimate) and 42,688,190 (2012 estimate). - Guadalupe Island or Isla Guadalupe is a volcanic island located off the west coast of Mexico's Baja California Peninsula and some southwest of the city of Ensenada in the state of Baja California, in the Pacific Ocean. The two other Mexican island groups in the Pacific Ocean that are not on the continental shelf are Revillagigedo Islands and Rocas Alijos. - A submersible is a small vehicle designed to operate underwater. The term "submersible" is often used to differentiate from other underwater vehicles known as submarines, in that a submarine is a fully autonomous craft, capable of renewing its own power and breathing air, whereas a submersible is usually supported by a surface vessel, platform, shore team or sometimes a larger submarine. In common usage by the general public, however, the word "submarine" may be used to describe a craft that is by the technical definition actually a submersible. There are many types of submersibles, including both crewed and uncrewed craft, otherwise known as remotely operated vehicles or ROVs. Submersibles have many uses worldwide, such as oceanography, underwater archaeology, ocean exploration, adventure, equipment maintenance and recovery, and underwater videography. - South America is a continent located in the western hemisphere, mostly in the southern hemisphere, with a relatively small portion in the northern hemisphere. It is also considered a subcontinent of the Americas, which is the model used in nations that speak Romance languages. The reference to South America instead of other regions (like Latin America or the Southern Cone) has increased in the last decades due to changing geopolitical dynamics (in particular, the rise of Brazil). - The Baja California Peninsula is a peninsula in Northwestern Mexico. Its land mass separates the Pacific Ocean from the Gulf of California. The peninsula extends from Mexicali, Baja California in the north to Cabo San Lucas, Baja California Sur in the south. It ranges from at its narrowest to at its widest point and has approximately of coastline and approximately 65 islands. The total area of the Baja California Peninsula is . - Sonora, officially the Free and Sovereign State of Sonora, is one of 31 states that, with Mexico City, comprise the 32 federal entities of Mexico. It is divided into 72 municipalities; the capital city is Hermosillo. Sonora is located in Northwest Mexico, bordered by the states of Chihuahua to the east, Baja California to the northwest and Sinaloa to the south. To the north, it shares the U.S.Mexico border with the states of Arizona and New Mexico, and on the west has a significant share of the coastline of the Gulf of California. - The Caribbean Sea is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico and Central America to the west and south west, to the north by the Greater Antilles starting with Cuba, to the east by the Lesser Antilles, and to the south by the north coast of South America. - Arizona (O'odham: "Al onak" [ai onak]) is a state in the southwestern region of the United States. It is also part of the Western United States and the Mountain West states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, and one point in common with the southwestern corner of Colorado. Arizona's border with Mexico is 389 miles (626km) long, on the northern border of the Mexican states of Sonora and Baja California. - Mexico City, officially City of Mexico (, ; abbreviated as "CDMX"), is the capital and most populous city of the United Mexican States. As an "alpha" global city, Mexico City is one of the most important financial centers in the Americas. It is located in the Valley of Mexico ("Valle de Mexico"), a large valley in the high plateaus at the center of Mexico, at an altitude of . The city consists of sixteen municipalities (previously called boroughs). - Baja California Sur, lit. "South Lower California", officially the Free and Sovereign State of Baja California Sur, is the second-smallest Mexican state by population and the 31st admitted state of the 31 states which, with the Mexico City, make up the 32 Federal Entities of Mexico. - Mexico (, modern Nahuatl ), officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Covering almost two million square kilometers (over 760,000sqmi), Mexico is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 120 million, it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America. Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana and Leon. - Intelligent Whale, an experimental hand-cranked submarine, was built on the design of Scovel Sturgis Merriam in 1863 by Augustus Price and Cornelius Scranton Bushnell. In 1864 the American Submarine Company was formed, taking over the interests of Bushnell and Price and there followed years of litigation over the ownership of the craft. When title was established by a court the submarine was sold on 29 October 1869 through a contract made by owner Oliver Halstead and Secretary of the Navy George M. Robeson to the United States Navy Department, with most of the price to be paid after successful trials. In September 1872 the first trial was held and was unsuccessful, whereupon the Department refused further payments and abandoned the project. - Underwater videography is the branch of electronic underwater photography concerned with capturing underwater moving images as a recreational diving, scientific, commercial, documentary, or filmmaking activity. History. In 1940 Hans Hass completed "Pirsch unter Wasser" (i.e. "Stalking under Water") which was published by the Universum Film AG, lasted originally only 16 minutes and was shown in theatres before the main movie, but would eventually be extended by additional filming done in the Adriatic Sea close to Dubrovnik. It premiered in Berlin in 1942. - Colombia (or ), officially the Republic of Colombia, is a transcontinental country largely situated in the northwest of South America, with territories in Central America. Colombia shares a border to the northwest with Panama, to the east with Venezuela and Brazil and to the south with Ecuador and Peru. It shares its maritime limits with Costa Rica, Nicaragua, Honduras, Jamaica, the Dominican Republic and Haiti. It is a unitary, constitutional republic comprising thirty-two departments. The territory of what is now Colombia was originally inhabited by indigenous peoples including the Muisca, the Quimbaya and the Tairona. - Sub Marine Explorer is a submersible built between 1863 and 1866 by Julius H. Kroehl and Ariel Patterson in Brooklyn , New York for the Pacific Pearl Company . It was hand powered and had an interconnected system of a high - pressure air chamber or compartment , a pressurized working chamber for the crew , and water ballast tanks . Problems with decompression sickness and overfishing of the pearl beds led to the abandonment of Sub Marine Explorer in Panama in 1869 despite publicized plans to shift the craft to the pearl beds of Baja California . - The Pacific Pearl Company was incorporated in the American state of New York on November 18, 1863. Principal officers included John Chadwick as President, George Wrightson as Treasurer, and Julius H. Kroehl as Chief Engineer. Other shareholders included William Henry Tiffany, Charles D. Poston and William M.B. Hartley. The company was a venture to harvest pearls and pearl shells in the Pacific Ocean. The first site chosen was Panama, in particular the Pearl Islands. After Kroehl recovered sufficiently from malaria he contracted while serving the Union Navy during the Vicksburg Campaign, he began designing and building a vessel at Ariel Patterson's Shipyard near the Brooklyn Navy Yard. Also being built nearby was the Intelligent Whale under the direction of Scovel S. Merriam. There were many companies active in submarine salvage at this time. - A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term most commonly refers to a large, crewed vessel. It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Used as an adjective in phrases such as "submarine cable", "submarine" means "under the sea". The noun "submarine" evolved as a shortened form of "submarine boat" (and is often further shortened to "sub"). For reasons of naval tradition, submarines are usually referred to as "boats" rather than as "ships", regardless of their size. - A vehicle (from ) is a mobile machine that transports people or cargo. Typical vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses), railed vehicles (trains, trams), watercraft (ships, boats), aircraft and spacecraft. - The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south and is bounded by Asia and Australia in the west and the Americas in the east. - Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northernmost and westernmost of the 31 states which, with Mexico City, comprises the 32 Federal Entities of Mexico. Before becoming a state in 1953, the area was known as the North Territory of Baja California ("El Territorio Norte de Baja California"). It has an area of , or 3.57% of the land mass of Mexico and comprises the northern half of the Baja California Peninsula, north of the 28th parallel, plus oceanic Guadalupe Island. The mainland portion of the state is bordered on the west by the Pacific Ocean, on the east by Sonora, the U.S. State of Arizona, and the Gulf of California (also known as the "Sea of Cortez"), and on the south by Baja California Sur. Its northern limit is the U.S. state of California. What object entity has the relation of 'operator' with the subject 'sub marine explorer'? Choices: - australia - chihuahua - colombia - dubrovnik - el salvador - mexico - mobile - refer - southern - union navy - united states navy
A:
united states navy