Did you happen to notice which mark of Canberra it was? They had one variant (PR 9)?where the Navigator sat in the nose, to get in you had to open the nose, he strapped in and they closed it again. No forward view, just a side window. The ejection seat went up just in front of the pilot.
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At least he had an ejector seat, the navigator in the B(I)8 who was also put in the nose, had to jump!