system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:In films such as Horatio Hornblower from 1951 they have amazing live action sailing footage of old sailing ships. How did they make them so realistically?
gpt
They used real ships.  :)

Even today, there are a number of people and organizations dedicated to preserved old sailing vessels, and many ships of this type still operate, mostly for recreation or tourism, around the world.