sentence: There are some people water tubing down a river. sentence:  One of the tubers comes on a blue tube wearing a yellow helmet and blue vest is followed by several tubers also on blue tubes. sentence:  They go down the river on the their tubes as they try hard to stay afloat on the turbulent waves. sentence:  Several tubers are seen going down the river in groups of four as they pass by trees and rocks. sentence:  The tubers then get off of their tubes and walk on the banks of the river towards a building while carrying the tubes in their hands.