Many of the really big ships have pivoting propeller systems at the stern and horizontally mounted propellers in the bow to maneuver. As far as cranes, when I lived in Osaka, taking the train to Kobe goes along Osaka Bay and I remember seeing these super-massive floating cranes. To this day I wonder what kind of physics magic they use to stay afloat while lifting such monumental loads. Hats off to the engineers that make life so amazing. I had the priveledge to sail on the " Big E " as we called her. She was like no other ship by any means. I was stationed on her while she was in complete overhaul at PSNS in Bremerton Wa. While in overhaul i was able to get quite familiar with her due to my clearance level. It allowed me to enter spaces that not just any sailor could enter. I really enjoyed my time stationed on her and was sad when my enlistment was up and we parted ways. But thankful just the same that i was able to have the experience of living on her like i did. That and all the lifelong friends i came to meet on her has made a lifetime of memories for me and ones that i will never forget. I was deeply saddened to hear that she was sold last year and due to be dismantled for scrap. What a dishonorable way to treat a vessel that served her country in so many memorable ways during her commision.