
Visual effects "drain" the waters around the prison of Alcatraz. The sea floor reveals scars left by earthquakes, and may help predict when the next "big one" will strike.

Visual effects "drain" the waters around the prison of Alcatraz. The sea floor reveals scars left by earthquakes, and may help predict when the next "big one" will strike.

Visual effects "drain" the waters around the prison of Alcatraz. The sea floor reveals scars left by earthquakes, and may help predict when the next "big one" will strike.