That doesn't quite make sense to me yet. If you've blown the main ballast tanks (hence-forwards MBT's) at 200m, then the air pressure inside is circa 20 atmosphere's, however, by the time you reach the surface you've still got 20 bar in the MBT's, but nil outside water pressure.
So unless you've vented that high-pressure air in the MBT's during the ascent, you've now an air-pressure being exerted on the inside of the MBT's of 19 bar, or 266lbs per square inch.
That's an awful lot! So either the MBT's were resistive to pressures of that order, or, there was a means to relieve climbing air-pressure within the MBT's as the U-boat ascended?
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