RedactedNarrative: Bowfishing in roughly 2 feet of water.  We were at idle speed while under power of the fan motor which was roughly 1ph.  There was a submerged object that was firmly planted in the bottom of the lake that was roughly 10" under the surface of the water.  Due to water visibility we could not see the object.  Since we did not see the pole the boat struck the submerged object causing the boat to come to a sudden halt.  As the boat stopped it caused my passenger and I to fall headfirst into roughly 2 feet of water.  We fell headfirst because the railing on the shooting deck of the boat; when we fell forward due to the boat stopping suddenly the railing assisted in causing us to go further  I immediately helped subject back into the boat and got extra sweatshirts and coveralls out to help keep him warm while I got him back to shore.  ER checked him out with no issues other than a sprained neck. 
  
  Incident reported to Warden