Swedish cable manufacturer Hexatronic has released a promotional video that includes some nice footage of its submarine cable-making operation.  The video is on YouTube at https://www.youtube.com/watch?v=li_suALnBqU.  The part showing the submarine cable works is in the last minute-and-a-half of the six-minute video.  It is brief, but for those who are not familiar with the process, it is an interesting introduction.