subclass_of paltus-class submarine
Remotely operated vehicles are vehicles which are controlled by an ___MASK93___ who is not in the ___MASK77___ . These can be operated by radio control , or through a cable or line connecting the ___MASK77___ to the operators location . A ___MASK8___ is a large buoyant ___MASK73___ . Ships are generally distinguished from boats based on size , ___MASK48___ and cargo or passenger capacity . Ships are used on lakes , seas , rivers , and oceans for a variety of activities , such as the transport of people or goods , ___MASK66___ , entertainment , public safety , and warfare . Historically , a " ___MASK8___ " was a sailing vessel with at least three square - rigged masts and a full bowsprit . A ___MASK99___ is a watercraft capable of independent operation underwater . It differs from a ___MASK78___ , 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 ___MASK23___ and the wet sub . Used as an adjective in phrases such as " ___MASK99___ cable ", " ___MASK99___ " means " under the sea ". The noun " ___MASK99___ " evolved as a shortened form of " ___MASK99___ 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 ___MASK78___ is a small ___MASK77___ designed to operate underwater . The term " ___MASK78___ " is often used to differentiate from other underwater vehicles known as submarines , in that a submarine is a fully autonomous ___MASK90___ , capable of renewing its own power and breathing air , whereas a ___MASK78___ 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 ___MASK90___ that is by the technical definition actually a ___MASK78___ . There are many types of submersibles , including both crewed and uncrewed ___MASK90___ , 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 . A wet sub is a ___MASK63___ of ___MASK41___ ( submarine ) that does not provide a dry environment for its occupants . Usually , wetsuited scuba divers will ride upon the device ( as one would ride a motorcycle or with an opening as in an Olympic bobsled ), although it can be designed to fully enclose its occupant ( s ) to provide lower drag . An enclosed vehicle may provide a dry viewing chamber for the occupant ( s ). The motive force is an electric motor and usually the power source is an electric battery . The depth and duration at depth is typically limited by the requirements of a scuba diver . A ___MASK23___ ( also called a mini submarine ) is any submarine under 150 tons . Typically operated by a crew of one or two but sometimes up to 6 or 9 , 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 other support staff . ___MASK73___ are ___MASK15___ - borne vehicles including ships , boats , hovercraft and submarines . ___MASK73___ usually have propulsive capability ( whether by sail , oar or engine ) and hence are distinct from a simple device that merely floats , such as a log raft . The Paltus Class ___MASK99___ is a Russian special purpose mini - ___MASK99___ of project 1851 . 1 . Two boats were completed `` AS - 21 '' and `` AS - 35 '' as a follow up of the single `` X - Ray '' class ___MASK11___ `` AS - 23 '' ( Project 1851 ) . They are both part of the 29th special ___MASK99___ squadron at Olenya Guba . A ___MASK11___ is a watercraft of a large range of sizes designed to float , plane , work or travel on ___MASK15___ . Small boats are typically found on inland waterways ( e . g ., rivers and lakes ) or in protected coastal areas . However , boats such as the whaleboat were designed for operation from a ship in an offshore environment . In naval terms , a ___MASK11___ is a vessel small enough to be carried aboard another vessel ( a ship ). Another less restrictive definition is a vessel that can be lifted out of the ___MASK15___ . Some definitions do not make a distinction in size , as bulk freighters long on the Great Lakes are called oreboats . For reasons of naval tradition , submarines are usually referred to as ' boats ' rather than ' ships ', regardless of their size and shape . Ships are generally distinguished from boats based on their larger size , shape and cargo or passenger capacity .