A massive crane known as P-82 has left Manitowoc and is beginning a three-to-four-month journey to Pearl Harbor, where it will service aircraft carriers and submarines at a naval base.Residents gathered to watch the 228-foot-tall crane depart, many arriving before sunrise to catch a glimpse of the moment.Watch the full broadcast here: Manitowoc's P-82 crane begins its journey to Pearl Harbor Naval Base"It's not very often you get to see a big 20…