I just came here to post that video.
Wow! Did they find a lot of treasure! There is a guy we watch on one of the streaming services that does the same thing in different spots and it is fascinating what he finds. Lots of sunglasses and I phones, trash of course.
One of my hobbies is to walk along the banks of rivers and lakes where the wind washes stuff up into concentrated areas and find "treasure". Lots of bobbers, some PFD's, caps etc. Once, at Lower Monumental dam on the Snake i found a sign for a resort in Hells Canyon. It's hanging in my garage.