The Concorde's cruising altitude was 60,000 ft. I believe if the cabin ruptured at this altitude, everyone onboard would be almost instantly killed, if not from the Armstrong limit then from hypoxia (as oxygen masks cannot supply sufficient oxygen at that altitude).
Therefore, there should have been extra protection against cabin decompression in the Concorde. This type of accident would have probably caused an immediate stop to the Concorde program.
What safeguards did the Concorde have against an uncontrolled decompression?