Don’t assume that data isn’t recoverable, no matter what it has been through, says Jim Reinert. Send the media to a professional data recovery facility as soon as possible. Don’t attempt to dry water-damaged media by opening it or exposing it to heat. Hard drives flooded in salt water require special treatment. Because data can be damaged quicker due to salt oxidizing on the media, the drive should be sent in an airtight container. To reduce the risk of further damage, drives can be “bathed” in distilled or fresh water.”]
Source: https://www.healthcareinfosecurity.com/tips-for-recovering-data-from-water-damaged-devices-a-955