I've read the text...and I don't think it was taken from any historical context...there's too much Hollwood in it. There are some inconsistencies in the submarine portion of the story, for instance, coming up to periscope depth, looking around, and surfacing, only to be immediately jumped by a dazzle painted destroyer... An event like that happening would have meant the court martial of the sound man...especially when you can hear a DD moving from miles away. Has it happened before? Probably, but, if a DD was lurking about without her engines on, it would have taken her a pretty good amount of time to get up to speed. HIghly unlikely, since any sitting ship is an easy target.
The shearing off of the radio mast is another...'all the noise suddenly stopped' or something to that effect. U-boats could only operate their radio gear from the surface, and there certainly wouldn't be any way to tell that a radio array had been swept clean until you tried to send a message, but then again, you would have noticed when you surfaced. The mere fact that there's 'noise' in the boat contradicts standard U-boat practice, especially when something as simple as dropping a wrench could give your position away to sonar operators on the surface.
The captain's orders of 'get us the hell out of here' is also a bit Hollywood. At at maximum submerged speed of 7 knots, where are they going? Besides, there was no comment about the necessary things like closing main vents, what depth to set, what down angle on the planes to set, what speed, course, etc...
I'm not saying it couldn't have been a passage taken from a war diary, but it doesn't read like any I've ever read...
My two pence,
Jeff Herne
Modelwarships.com