My son works on installing and troubleshooting those big high wind turbines. I worry about him, too. He assures me it is really quite safe with all the safety stuff they have to use. He says that even if his main safety harness fails there's a backup so it is almost impossible to fall. He's been doing this for years and gets sent all over the country to do it. The only time he's gotten hurt is by tripping over a cable on the ground -- he fell and broke his wrist.