At first it was assumed that everyone died in the explosion, but there’s evidence that proves otherwise. Allegedly, NASA obscured the truth that the cabin didn’t depressurize upon the accident, but that the crew was alive and conscious and they ascended 3 more miles, then plummeted 12 miles down into the ocean.
When the cabin was recovered, it was noted that several astronauts had activated their personal emergency air packs, before their impact.