They found Mary Jo in the backseat of the car with her face pressed to the floorboards; her lips were pulled back, frozen in a snarl as she gasped her last breaths. Nice. If Kennedy were any kind of man (and not concerned with covering his own ass) then he could've freed Mary Jo himself. The car wasn't fully submerged. The whole rear-end was sticking out of the water.
Inquest Exhibit #14 - Sketch of Mary Jo Kopechne's position in accident car prepared under the direction of scuba-diver John Farrar. *Note: Original Water Level refers to pocket of air trapped in car.
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Sometimes people die in accidents no matter how much rescuers or doctors work to save them. In this case, there was no reason whatsover that this young woman should have died. Kennedy should have been convicted of a minimum of voluntary manslaughter and spent several years in prison. He spent nine hours covering up his involvement. What a piece of human debris.