Why Giulio Cesare was hard to attack at Taranto

Where was Giulio Cesare during the Taranto raid, and why did aircraft not reach her?

She was shielded inside the harbor by other battleships, so most attack approaches required aircraft to fly over easier targets first.

Giulio Cesare lay inside Taranto harbor with other battleships surrounding her. From most useful attack directions, a torpedo or bombing run would have to pass over two other capital ships. Those nearer targets were easier to engage without accepting the extra exposure. Her survival therefore owed something to harbor geometry and fleet disposition rather than simply being overlooked.