Method for acquiring analysis data in an observation zone of an underwater environment, said method comprising: - deploying, for a first mission to acquire first analysis data, of a first group (G 1) of underwater motorized vehicles (1 1, 2 1, 3 1) capable of moving in a coordinated manner in said observation zone according to a first pattern (M 1) of trajectories to be followed by said motorized vehicles, each underwater motorized vehicle (1 1, 2 1, 3 1) being equipped with at least one sensor (14, 14 C, 14 L, 14 R) dedicated to the acquisition of a type of analysis data, said first mission being defined by a first predetermined set of mission parameters comprising said first pattern (M 1) of trajectories, at least one type of first analysis data to be acquired, and operating parameters relating to the sensors of the first group capable of acquiring data corresponding to said at least one type of first analysis data to be acquired; - deploying, for a second mission to acquire second analysis data, of a second group (G 2) of underwater motorized vehicles (1 2, 2 2, 3 2) capable of operating in a coordinated manner in said observation zone according to a second pattern (M 2) of trajectories to be followed by said motorized vehicles, each underwater motorized vehicle (1 2, 2 2, 3 2) being equipped with at least one sensor (14, 14 C, 14 L, 14 R) dedicated to the acquisition of a type of analysis data, said second mission being defined by a second set of mission parameters comprising said second pattern of trajectories, at least one type of second analysis data to be acquired, and operating parameters relating to the sensors of the second group capable of acquiring data corresponding to said at least one type of second analysis data to be acquired; at least one of the mission parameters of said second set being function (140; 155) of at least one of the first analysis data acquired during the first mission, characterized in that said first and second missions are carried out concomitantly, said at least one of the mission parameters of said second set being adjusted in real time as a function of said at least one of the first acquired analysis data, said method comprising a step of direct or indirect transmission of data from at least one underwater motorized vehicle (1 1, 2 1, 3 1) of the first group (G 1) to at least one underwater motorized vehicle of the second group (G 2). - deploying, for a first mission to acquire first analysis data, of a first group (G 1) of underwater motorized vehicles (1 1, 2 1, 3 1) capable of moving in a coordinated manner in said observation zone according to a first pattern (M 1) of trajectories to be followed by said motorized vehicles, each underwater motorized vehicle (1 1, 2 1, 3 1) being equipped with at least one sensor (14, 14 C, 14 L, 14 R) dedicated to the acquisition of a type of analysis data, said first mission being defined by a first predetermined set of mission parameters comprising said first pattern (M 1) of trajectories, at least one type of first analysis data to be acquired, and operating parameters relating to the sensors of the first group capable of acquiring data corresponding to said at least one type of first analysis data to be acquired; - deploying, for a second mission to acquire second analysis data, of a second group (G 2) of underwater motorized vehicles (1 2, 2 2, 3 2) capable of operating in a coordinated manner in said observation zone according to a second pattern (M 2) of trajectories to be followed by said motorized vehicles, each underwater motorized vehicle (1 2, 2 2, 3 2) being equipped with at least one sensor (14, 14 C, 14 L, 14 R) dedicated to the acquisition of a type of analysis data, said second mission being defined by a second set of mission parameters comprising said second pattern of trajectories, at least one type of second analysis data to be acquired, and operating parameters relating to the sensors of the second group capable of acquiring data corresponding to said at least one type of second analysis data to be acquired; at least one of the mission parameters of said second set being function (140; 155) of at least one of the first analysis data acquired during the first mission, characterized in that said first and second missions are carried out concomitantly, said at least one of the mission parameters of said second set being adjusted in real time as a function of said at least one of the first acquired analysis data, said method comprising a step of direct or indirect transmission of data from at least one underwater motorized vehicle (1 1, 2 1, 3 1) of the first group (G 1) to at least one underwater motorized vehicle of the second group (G 2).