Did the loss of HMS M1 end the cruiser-submarine idea?

Did the sinking of HMS M1 kill off the Royal Navy's cruiser-submarine concept?

Not by itself; the disappointing service performance of M1 and related experiments did more to discredit the concept.

A viewer asks whether the loss of HMS M1 killed the Royal Navy's interest in cruiser submarines. The ship's service experience had already done more damage to the concept than the sinking itself. X1's later record likewise exposed unreliable machinery, poor accommodation, and gun-handling problems despite good diving arrangements. Repeated operational shortcomings, rather than one dramatic casualty, can end a line of naval experimentation.