Closer shot of Alcatraz. Alcatraz was a prime location during the civil war, since it had a perfect view of the entire bay from its location. They had also made it so that there was only one way on and off the island, which lies on the opposite side of the island from the bay's mouth to the ocean. When it became a prison, inmates were told that besides the water's treachorous currents and freezing temperatures, it was also shark infested. Which is true, but the sharks are too small and harmless to humans.