Some type of dry dock! could be right Damien.
I have been recording / watching a program on Quest. called Mighty Ships.
Some real eye-openers on there.
Ships that plant wind turbines on the seabed, or Hoover and process diamonds off the seabed and many more.
In all 42 of the biggest, specialist and most advanced ever built. If you get a chance to see these programmes they are well worth the watching.
In this instance tv definitely not stealing your valuable time.