Underwater Blur Effect Help

Hey, I’m testing out my underwater blur and it’s not working, can someone tell me why?

I get this error : Underwatersrc.cs(12,15): error CS0103: The name `underwaterblurt’ does not exist in the current context

Here’s the code

using UnityEngine;
using System.Collections;

public class Underwatersrc : MonoBehaviour {
	public AudioClip Underwatersound;
	
	
	void Blureffectunderwater(){
	BlurEffect underwaterblur = Camera.main.gameObject.GetComponent (typeof(BlurEffect)) as BlurEffect;
          if(underwaterblur == null)
          {
              underwaterblur = Camera.main.gameObject.AddComponent(typeof(BlurEffect)) as BlurEffect;
              underwaterblur.iterations = 2;
              underwaterblur.blurSpread = 0.2f;
              underwaterblur.enabled = true;
              
          }
	}
	
	
	void Update() {
		
		if(Camera.main.transform.position.y < 26){
		RenderSettings.fogMode = FogMode.Exponential;
		RenderSettings.fog = true;
			RenderSettings.fogDensity = 0.085f;
			RenderSettings.fogColor = new Color (0.22f, 0.65f, 0.77f, 0.5f);
			underwaterblur = true;
			
		}
		else {
			
			RenderSettings.fogMode = FogMode.Linear;
		    RenderSettings.fog = true;
			RenderSettings.fogDensity = 0.85f;
			RenderSettings.fogColor = Color.white;
		
			
		}
	}
	
}

… underwaterblurt is not underwaterblur. There’s a ‘t’ too much.