 Jones made four more runs.On one, watched by the Swiss across the water, he was coned by searchlights and made a shallow dive at near maximum speed (360 mph indicated), faster than the searchlight crews could follow.Now down below the marker aircraft, he had to abandon another run because at that height the shockwaves from the main force's bombs, particularly the 4,000 lb ‘cookies’, made it impossible to keep the Lancaster steady.