Hull giving in

If you need a sort of metal version of a wood door squeaking in pulses (ee-eh-eh-eh-eh–eh) – like a hull expanding / contracting – here’s a way: I’ve had some success by using a good wood squeak mixed with a the sound of a metal plate ringing after being hit.

But you need to use a volume envelope in some audio software and let the volume of the metal ringing rise an fall with each single squeak/pulse of the wood sound. That way the wood squeak will get a metal ring/feel.
– David Filskov