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Well;
The price on this unit seems to have been right..
Cut it in half will be a traditionally seen military solution in regard to having to abandon materials.To put it at auction or to get a signature on a weaver..will be seen as a more modern idea by many.
As far as your question is concerned;
1- You can open the hull at top and drill holes on the keel section and assess the degree of water containment.
2-Remove the foam manually and replace with fresh material
3-Have it drying up in a heated structure while being opened.
This last solution may take months or years to "dry" said foam.
No; First thing first.
You will have to decide if these kind of efforts will be worth it since the hull has been scrapped as you have described.
It may possibly a time to consider and pass on that one.