Final answer:
The hypothetical posed in the question doesn't align with known maritime operators' requirement. Sonar can detect large underwater objects, the precision in identification depends on the sonar system and its operating conditions. Submerged objects are partly supported by the buoyant effect of water.
Step-by-step explanation:
The question poses a hypothetical regulation for object lengths within maritime activity, but as it stands, it does not reflect real protocols. Generally, in maritime regulation, the size of the vessel dictates the requirements for safety equipment like life jackets, radars, and other emergency necessities, not the objects it is transporting or encountering.
Regarding the sonar capability mentioned in the given references, sonar is indeed used for detecting and locating large underwater objects. However, the ability to identify the smaller particulars of an object depends on the precision of the sonar system and the conditions in which it operates. Example, a sonar in a submarine can measure echo times with a precision that enables it to spot minute differences in distances.
Lastly, substances submerged in water are partly supported by water due to the buoyant effect. This fact is exemplified in submarines, which can adjust their density to control their buoyancy, and in helium-filled balloons that float in air.
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