My understanding was that it's not just the cold itself, but also the fact that there are no trees anywhere close by and therefore no microbes that have evolved to eat wood. (I guess if any had accidentally evolved they'd have starved to death long before the wreck appeared)
Whatever the...
From the BBC article: 'The wreck itself is a designated monument under the international Antarctic Treaty and must not be disturbed in any way. No physical artefacts have therefore been brought to the surface'