Celebrity Solstice was, at 122,000 GT, the largest ship to be built at a German shipyard, but this record was surpassed by the Disney Dream, a 128,000 GT cruise ship of the Disney Cruise Line.
Languages can definitely change and they can diverge. For example, Latin split up into the modern Romance languages: Portuguese, Spanish, Romanian, Galician, etc. This is less known, but languages can also converge: those languages are called creole. Some people argue that English is also similar to a creole: a mix of Germanic and French.
This is going to depend very much on the dead language you are thinking of learning. For the major dead (aka extinct) languages, such as Latin, Sanskrit, or ancient Greek, there are still classes taught in the langauges and you will have an opportunity to speak the languages there.