I was more than sure that FDR (as good as any other electronic device including magnetic strip, i.e. HDD), after sitting for a few days under the sea or ocean, must unconditionally be transported wet (i.e. inside some water container) to simply not let magnetic strips to get dry. The answers to this related question confirm this.
Yet, I have just saw a reconstruction and investigation of Ethiopian Airlines Flight 409 crash and noticed that:
- FDR (found and extracted first) was transported dry, enclosed in an empty box,
- CVR (found and extracted few days later) was transported in a box filled with water.
Is this just a "bug" in movie or can FDRs be transported dry after extracting them from sea / ocean?