RedactedNarrative: Subject1 said that he noticed there was water entering the boat while he was on Keewaydin and that he and his brother removed all of the water, but when they got back underway to head back to 951 boat ramp the boat became sluggish. He stated he had problems keeping the boat on plane and at full throttle the vessel would not move. Subject1 said that the vessel could not get on plane and that the waves were bad while they were trying to come back through Marco Pass. He said after the vessel settled in the water, the boat became submerged, and he immediately called 911.
  
  After reviewing the witness accounts, I determined that the vessel became submerged from taking on water while heading from Keewaydin back to 951 boat ramp.  Subject1 stated that he was having problems with water entering the vessel before leaving Keewaydin and that he bailed the water out before heading back to 951 boat ramp. After leaving Keewaydin the vessel immediately got swamped as soon as it got to the pass. The extra weight in the stern from the water intrusion led to the vessel's engine not being able to keep the vessel on plane. The lack of forward movement along with high swells approaching the stern caused the stern of the vessel to dip below the water line, swamping the vessel. The vessel is an open design without a rear gunwale near the transom. Due to the influx of water, hull design, and inclement sea conditions, the vessel took on water from the stern and became submerged. The vessel sustained moderate damage due to water intrusion throughout the electrical system as well as the engine.
  
  
  No injuries were sustained.