17 THE DAY WAS A PEACEFUL one: they spent the whole of it at sixty feet, relying on the Asdics to provide warning of any enemy: the thing to dread was the return of those A/S trawlers. If aircraft passed near, or over - well, they passed: MacGregor had no wish to see them or even to know if the Germans were searching. All Setter had to do was to keep out of sight and get to the new rendezvous position at the appointed time. Until then, it was more than ever essential that the enemy should have no inkling of Setter’s position or course. They must have known something of the first rendezvous plans, but there was no reason to believe that they’d have similar knowledge of the new ones, and if they caught a glimpse of the submarine, if some patrolling or searching aircraft spotted the white fe

