You are now wearing scuba gear and swimming under water at the depth of 66.0ft.you are breathing air at 3.00at?

you are now wearing scuba gear and swimming under water at the depth of 66.0ft.you are breathing air at 3.00atmospheric and your lung volume is 10.0litre.your scuba gauge indicates that your air supply is low so,to conserve air,you make a terrible and fatal mistake.you hold your breath while you surface.what happens to your lungs?why?