 After forming up , the bombers and fighters began their flight to Kaafjord at 01 : 35 . The aircraft flew 50 feet ( 15 m ) above the sea to evade German radar until they reached a point ten minutes flying time from the Norwegian coast , at which time the Barracudas climbed to 9 @,@ 000 feet ( 2 @,@ 700 m ) and the fighters to higher altitudes . The weather was fine throughout the flight , but clouds were sighted as the aircraft neared the target area . 
