RedactedNarrative: O1 and P1 were traveling upstream near Oahe Downstream swimming area around 12:15 PM. O1 stated they were on the water for an hour and a half when the wind started picking up. O1 started heading back to the boat ramp when a wave turned the boat hard starboard. O1 stated that it all happened in slow motion and the next thing they remember is being trapped under the boat. O1 and P1 were safely able to get out from underneath the boat. P1 was able to grab a phone and call 911. O1 and P1 were wearing PFD's and the engine cutoff switch at the time of the accident. No alcohol was consumed.