Dropped my Lumia 925 in ice cold stream during camping

Went to a hiking trip in Pennsylvania early morning. Freezing temp and ground was covered with ice. While crossing a bridge over an icy stream,I slipped and my phone fell from my pocket into the bottom of stream fully submerged in ice cold water. Took me 10 minutes to get to it and recovered from stream. It turned on right after that but start to act weird and eventually died . I dried it as much as I could but was fairly certain that it is gone. After a couple of hours I felt buzzing in my pocket and there it was working again with no issues. It just has clear TPU case. This phone survived pretty well.