Was the M1 submarine also Bearn-like?

Would the M1 submarine count as a Bearn-like design?

Yes, it was a serious candidate, but it did not make the Royal Navy's top three examples.

M1 was considered for the list and ranked among the candidates, but the episode limits each navy to its strongest examples. The York class ultimately took the Royal Navy's top position under the video's design criterion. M1 still qualifies as a strong example of the same self-defeating design pattern.