RedactedNarrative: V-1 was travelling south in the st lucie river near green day marker #27. The operator of v-1 observed his bilge pump was not working and the vessel was taking on water fast. Operator advised when he observed the vessel taking on water, he headed west out of the channel to get in shallow water. Operator advised when he exited the channel he slowed down in front of meridian marina, the vessel started taking on more water rapidly. When the stern of the vessel was completely submerged operator and his passenger had to abandon the vessel. A passer by boat and two jet skis assisted getting operator and occupant to the marina docks. I contacted martin county fire rescue and had operator evaluated due to him having blood on his right elbow. Fire rescue only conducted first aid on operator. Tow boat u.s. arrived on scene and towed the vessel to palm city boat ramp. The boat was removed by trailer and taken to operator's residence. Bilge plug was not installed upon inspection