RedactedNarrative: On Wednesday, August 4, 2021, at approximately 1130 hours, boating accident #FWCC21OFF005769 occurred in St. Joseph Sound, Clearwater, Pinellas County, Florida near the second spoil island north of Memorial Causeway bridge.  Vessel one (V1) with one operator on board and Vessel two (V2) with one operator on board were traveling north in a PWC tour from Clearwater Beach Marina.  V1 was the first PWC behind the lead tour guide.  V2 was riding in the tour behind and to the port side of V1.  The lead tour guide slowed down and motioned for V2 to get back in direct file line behind V1.  At this time V1 had slowed down because the lead tour guide had slowed down.  The operator of V2 complied with the lead tour guide’s command to get back in line behind V1 and steered his vessel to the east and toward V1.  When V2’s operator steered toward V1 and realized his speed was over taking V1, V2’s operator let off the throttle and turned the PWC’s steering controls to the west.  However, V2 did not change direction of travel due to no propulsion.  V2 struck V1 and the operator at mid ship on the port side.  The operator of V1 sustained a serious injury to his left leg and was transported to Morton Plant Hospital.  The operator of V2 received no injuries.; OP1's received a serious injury to his left leg due to an impact from another PWC.  OP1 was transported to Morton Plant Hospital in Clearwater Florida.  There he was diagnosed with a broken leg.