If structural integrity is in doubt, then you go down at the current Mach into IAS.
I would consider a current cabin altitude climbing to 30,000ft plus in less than 10 seconds would indicate a hole in the fuselage, there is no way of knowing if it is structual and so I would react as if it was. Once the descent is on the way there is no harm in asking CC for information, but there is a good chance a hole would not be not visable in the cabin.