RedactedNarrative: SO received a call on 5/27/17 from O1 regarding V1 hitting a submerged rock pile and tore off the lower unit. WCO contact O1 and was able to get GPS coordinates of the location of V1. O1, P1 and P2 were in V1 located on the southern portion of Bitter Lake. O1 was traveling in a northeast direction at a speed of approximately 15-20MPH when V1 struck a submerged rock pile which resulted in tearing off the entire lower unit of the motor. None of the individuals on board were wearing their life jackets. WCO conducted a boat safety check once the boat was loaded and observed all of the required safety equipment on board. 