 After completing the high-speed maneuvers, standing orders called for the submarine to hold a steady course for three minutes to reestablish sonar contact, which had been disrupted by the high speed maneuvers, with any vessels in the area.In this case, however, Waddle ordered the submarine to change course and go to periscope depth after holding the steady course for only 90 seconds.As "Greeneville" ascended to periscope depth, Waddle checked the sonar displays and the fire control station monitors, but reported later that he heard and saw nothing to suggest that the previously detected vessels in the area were now any closer to the submarine's position than had been reported before the submarine began the high speed maneuvers.