What is fastest sustained speed of an object traveling underwater? Seeking to break this record is a noble pursuit because it is difficult. The leading edge of the vessel or object faces tremendous pressure as it hits and displaces water ahead of it -- air resistance but worse. The trailing edge likely experiences cavitation from bubbles of vacuum / water vapor formed where the vessel used to be. Both of these forces can be tremendously destructive.
The speed record is probably held by nuclear attack submarines, underwater rockets, or torpedoes. All of these military technologies are classified, so the actual speed of the record is unknown.
Establish a contest seeking the fastest travel time through a specified body of water, probably manned and unmanned categories. What is the longest great circle arc entirely through ocean? ("Longest straight-line sail")
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