The Salt River here is frequented every weekend by "tubers", people who float down the river on inner tubes, and float coolers of beer, stereo systems etc along beside them.
The alcohol tends to result in large numbers of items ending up at the bottom of the river.
This is just about half of what we found in 1 day.
Whoever dropped the item in picture 3 was probably not very popular with his friends for the rest of the day!
In a river...... and I thought it was sea weed!
shows my innocence .... have no idea what pic 3 is !!
Here's a hint:
Weird things to find lol.
"Tubers" I think you need to explain a bit more, sounds like a fun dive site