Entrapment is really not likely if you have the proper plumbing. We require at least 2 suctions, 6' apart and a vent to air. The vent is another stub up from the suction line at the bottom of the pool, extending up to free air. The water pressure itself could hold you down but not any suction from the pump. Every entrapment story I have heard traced back to an improperly installed system and most times a missing cover.
