I have yet to witness an air-raid first hand. The closest I've come was returning to Wilhelmshaven after a patrol. I was still out in the Jade when I thought I saw a flash of light in the distance. As I rounded the point and headed for the harbor I began to see smoke columns rising. Then I saw the sunken and burning ships, and the dockside fires. I never got close enough to see the planes though.
Here is the report I wrote at the time:
http://www.subsim.com/radioroom/show...7s+Patrol+Logs
See posts #21 and #22.