"Flo/Flo" operations are the trademark of unique submersible hull ships that transport yachts and other ships:
http://www.globalsecurity.org/military/systems/ship/images/blue-marlin-pic3.jpg
http://commons.wikimedia.org/wiki/File:MightyServantRoberts-gedreht-.jpg
http://www.dockwise.com/media/uploaded/MS1_3.jpg
http://www.marinelog.com/IMAGESMMV/yem4.jpg
