RedactedNarrative: Unit 1 was in tow of a tube (4 occupants) and pulled the tube into a tree. Unit 1 operator told her passenger that the ski does not turn properly to the left and was unable to turn to avoid the tube colliding with the tree. The two occupants on the jet ski were uninjured. All four occupants of the tube were transported to MUSC but were in stable condition. The ski was believed to be traveling approximately 20mph at time of collision. There was no visible damage to the jet ski, tube, or tree.