The present leader in the market of action cameras- “GoPro” is perhaps the most versatile and tough camera in the complete market and to support my point here is a recent example. The famous Youtuber Beau Ouimette who in his free times keeps on finding stuffs hidden underwater found a GoPro into the river bed.
No info. about its owner is available but the camera has footage of its dive into the river. This last footage of the camera where it falls into the rivers and stays on rest there until the battery drains out confirms the time period for which it’s been there.
Beau Ouimette uploads this footage on his official Youtube channel and also merges his footage in which he finds this GoPro.