The title pretty much sums it up: What are the chances of a Compact Flash card that has been submerged in sea water for a few days still working? The card in question has a pretty expensive licence tied to it, but the ordeal of getting to it involves a scuba suit and a shipwreck. It's not enough to just be able to retrieve the data from the card, as the phpsical card itself is important. And for the retrieval to be worth it, the card has to work.
For the record, We're talking about 5 meters of water. The card was plugged into a card reader all along, so this should restrict water ingress via the pins somewhat. I'm not sure how water tight (if at all) these cards normally are.