surveillance – n. close observation of something, especially a suspected spy or criminal

intercept – v. to stop and take someone or something from one place to another

monitor – v. to observe and check the progress or quality of something

artificial – adj. made or produced by humans rather than occurring naturally

vessel – n. a ship or large boat

maritime – adj. relating to the sea, especially relating to commercial or military activity

routine – adj. done very often; done or happening as part of a normal job

patrol – n. the act of moving through an area to make sure it is safe
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