I'm not sure but it is possible Duci created this because submarines did not start making creaking noises at PS depth much less at 150 feet. Talking with a few that have been on the fleets the subs would really not start creaking until 250-300. At 300 she would really start to sing. So, it is possible this is by design. RFB handle it in the same way. You get one creak when submerging (ambiance really) and more creaks when you get to 250-300 feet. Take you sub deeper and see if she creaks at or below her crush depth.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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