Well, it was a big well-designed tough ship. At 33,000 tonnes full load and 257 meters long she was just a smidgeon smaller than the Lexingtons or the Essexes, a bit narrower in beam, definitely faster and with about an equal tactical turning circle to an Essex. She had good captains. She had armor over her machinery and magazines twice as thick as any US or UK carrier until the Midways and she had (^^^) a well trained crew who practiced damage control in the British fashion. She was a combination of all three qualities. She made her own luck work, through hard work, until Cavalla ended her for good. By comparison, Zuikaku, luckier, was crewed by a less well-trained cast of characters. I call it ship's culture. Some ships get it right from the launch down the weighs and never let it go. Shokaku has that quality (Enterprise). Zuikaku, her sister, was the goat (Hornet), of the IJN. Bunch of very lucky clowns.