month a fuel leak threatened to up end the launch until a specialized team swept in to save the day. kristen fisher has this cnn exclusive. reporter: at t-minus 3:17 until the third launch attempt of the most powerful rocket built nasa s launch team detects a problem. tracking an intermittent leak. reporter: liquid hydrogen fuel is leaking. only way to fix it at this moment is to send a red crew. they said red crew, send red crew. reporter: ted garrett is a member of the red crew trained to work inside the blast zone. they asked my lead who s the red crew person. he asked for a volunteer and i said i ll go. reporter: basically a big bomb. yeah. reporter: on the launch pad. volunteering to go into a very